feat: Add Issue #195 - GoPro mount adapter for T-slot rail
- Implement GoPro 3-prong interface with standard mount compatibility - T-slot clamp base for sensor rail attachment - Tilt adjustment mechanism (0-90 degrees) - 7-position detent system (0°, 15°, 30°, 45°, 60°, 75°, 90°) - M5 thumbscrew retention for secure locking - Comprehensive BOM with sourcing and assembly instructions - Print settings, weight analysis, and QA procedures Issue: #195
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BOM_GOPRO_MOUNT.md
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# GoPro Mount Adapter - Bill of Materials
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## Issue #195
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### 3D Printed Components
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| Part | Qty | Material | Weight | Notes |
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|------|-----|----------|--------|-------|
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| GoPro Mount Base | 1 | PLA/PETG | ~8g | Top interface, receives GoPro 3-prong connector |
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| Tilt Arm Assembly | 1 | PLA/PETG | ~12g | Connects GoPro mount to T-slot clamp, rotates on pivot |
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| Pivot Housing | 1 | PLA/PETG | ~10g | Mounts to T-slot clamp, houses pivot pin |
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| T-Slot Clamp Base | 1 | PLA/PETG | ~6g | Fixed base mounting to sensor rail |
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**Subtotal Printed:** ~36g
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### Hardware Components
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| Part | Qty | Size | Material | Source | Notes |
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|------|-----|------|----------|--------|-------|
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| Pivot Pin (Bolt) | 1 | M8 x 40mm | Steel | Hardware Store | Central pivot for tilt mechanism |
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| Pivot Pin (Nut) | 1 | M8 | Steel | Hardware Store | Secures pivot pin |
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| Thumbscrew | 1 | M5 x 8mm | Steel with Knob | Hardware Store | Locks tilt position (standard M5 thumb knob) |
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| Detent Spring Ball | 1 | 4mm stainless | Stainless Steel | Ball bearing supplier | Springs into detent pockets (0°, 15°, 30°, 45°, 60°, 75°, 90°) |
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| Compression Spring | 1 | M4 x 15mm | Steel | Hardware Store | Pushes detent ball into pockets (spring constant ~3-4 N/mm) |
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| T-Nut | 1 | M4 x 20mm | Aluminum | T-slot Supplier | For T-slot rail mounting |
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| M4 Bolt | 4 | 8-10mm length | Steel | Hardware Store | Mounting bolts for T-nut (4-point pattern) |
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| Washer | 4 | M4 | Stainless Steel | Hardware Store | Under bolt heads to distribute load |
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| Hex Nut | 1 | M8 | Steel | Hardware Store | Secures pivot pin (if needed for adjustment) |
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### Assembly Materials
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| Item | Qty | Type | Purpose | Notes |
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|------|-----|------|---------|-------|
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| Thread-lock (Loctite) | 1 small tube | Medium strength (blue) | Lock thumbscrew position | Prevents vibration loosening |
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| Grease (PTFE-based) | 1 small tube | Silicone or PTFE | Lubricate pivot joint | For smooth tilt operation |
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| Sandpaper | 1 set | P400/P600 grit | Post-print finishing | Sand all moving surfaces smooth |
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### Print Settings
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| Parameter | Recommended |
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|-----------|-------------|
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| Material | PLA or PETG |
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| Nozzle Temperature | 200-210°C (PLA) / 230-245°C (PETG) |
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| Bed Temperature | 60°C (PLA) / 80-90°C (PETG) |
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| Layer Height | 0.2mm (standard) or 0.1mm (fine) |
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| Infill | 20-25% (higher for pivot areas due to stress) |
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| Supports | Yes - required for GoPro mount underside and pivot pockets |
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| Print Time | ~4-5 hours |
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| Estimated Weight | 36g printed (matches sub-50g target if optimized) |
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### Assembly Checklist
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- [ ] Print all 4 components with supports
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- [ ] Remove supports and sand surfaces
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- [ ] Sand pivot surfaces smooth (P600) for frictionless rotation
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- [ ] Clean all parts with compressed air
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- [ ] Install M8 pivot pin through housing and arm
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- [ ] Install M8 nut and washer on pivot pin (hand-tight + 1/2 turn)
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- [ ] Apply PTFE grease to pivot joint
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- [ ] Install 4mm detent ball in spring
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- [ ] Insert spring + ball assembly into detent housing
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- [ ] Install compression spring and M4 bolt for spring retention
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- [ ] Test tilt mechanism: should click into 7 detent positions
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- [ ] Install T-nut and M4 mounting bolts to T-slot rail
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- [ ] Install M5 thumbscrew for tilt locking
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- [ ] Apply thread-lock to thumbscrew (if needed)
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- [ ] Test GoPro mount: insert standard GoPro 3-prong connector
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- [ ] Verify all tilt detents hold firmly
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- [ ] Test thumbscrew locking at various angles
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### Sourcing Notes
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#### Where to Buy
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**3D Printing Service (if not printing yourself):**
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- Prusa Printing (prusa3d.com)
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- Shapeways (shapeways.com)
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- OnShape + local printer
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- ~$15-25 for all parts in PLA
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**Hardware (Local Options):**
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- Home Depot / Lowes: T-nuts, bolts, washers, springs
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- Ace Hardware: Thumbscrew knobs, grease
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- Amazon: Bulk hardware kits, ball bearings
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- McMaster-Carr: Premium hardware, precision springs
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**Specialty (Online):**
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- SDP/SI (sdp-si.com): Precision balls, springs
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- VXB Bearings: Ball bearings and precision components
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- Misumi: Aluminum hardware
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### Cost Breakdown
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| Category | Cost | Notes |
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|----------|------|-------|
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| 3D Printing | $2-5 | If self-printing; $15-25 if outsourced |
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| Hardware | $8-12 | Pivot pin, bolts, springs, thumbscrew |
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| Assembly Materials | $3-5 | Grease, sandpaper, thread-lock |
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| **Total** | **$13-22** | Budget-friendly sensor integration |
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### Weight Analysis
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| Component | Weight |
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|-----------|--------|
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| Printed parts | 36g |
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| M8 bolt + nut | 8g |
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| M5 thumbscrew | 3g |
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| Springs + ball | 2g |
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| T-nut + M4 bolts | 6g |
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| **Total** | **~55g** |
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**Note:** Can optimize to <50g by:
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- Reducing infill to 15% in non-stress areas
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- Using aluminum M8 bolt instead of steel
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- Using nylon M4 bolts instead of steel
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### Quality Assurance
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#### Testing Points
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1. **Pivot Smoothness:** No grinding or binding, smooth rotation
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2. **Detent Engagement:** Audible/tactile click at each 15° position
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3. **Tilt Lock:** Thumbscrew holds position against moderate force (~5 kg applied force)
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4. **GoPro Interface:** Standard GoPro mount seats fully and securely
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5. **T-slot Mounting:** Rock-solid attachment, no wobble
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6. **Repeated Use:** 100+ tilt cycles without wear
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### Maintenance
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- **Monthly:** Check thumbscrew tightness, verify detents still click
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- **As Needed:** Reapply PTFE grease to pivot if rotation becomes rough
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- **If Detents Wear:** Replace 4mm ball or detent pocket (reprint arm if needed)
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- **If Pivot Loosens:** Retighten M8 nut with 2mm clearance (should not be too tight)
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### Compatibility Notes
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**GoPro Models Supported:**
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- GoPro Hero 11/12 (with standard 3-prong mount)
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- GoPro Hero 9/10 (with standard 3-prong mount)
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- GoPro Hero 8 (with standard 3-prong mount)
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- Any device with standard GoPro 3-prong interface
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**Not Compatible:**
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- GoPro Hero 7 or older (different mounting system)
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- Devices without GoPro 3-prong connector
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**Adapter Options:**
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- Can add GoPro-to-other-mount adapters on top for non-GoPro cameras
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- Design allows stacking of standard GoPro accessories
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---
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**Bill of Materials Version:** 1.0
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**Design Status:** Complete
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**Last Updated:** 2026-03-02
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**Issue:** #195
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// GoPro Mount Adapter for T-Slot Sensor Rail
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// Issue #195 - GoPro 3-prong interface with tilt detents
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// T-slot mounting with thumbscrew retention
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// GoPro 3-Prong Interface Standards
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// Center prong: 14.5mm wide
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// Side prongs: 12.5mm wide
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// Prong depth: 8-10mm
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// Spacing between prongs: ~25mm
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// Constants
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GOPRO_PRONG_WIDTH_CENTER = 14.5;
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GOPRO_PRONG_WIDTH_SIDE = 12.5;
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GOPRO_PRONG_DEPTH = 9;
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GOPRO_PRONG_SPACING = 25; // Between center of side prongs
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T_SLOT_WIDTH = 20; // T-slot rail 20x20mm
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CLAMP_JAW_DEPTH = 18; // Clamp jaw depth
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CLAMP_WIDTH = 40; // Clamp internal width
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TILT_PIVOT_DIAMETER = 12; // Pivot pin diameter
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TILT_MIN = 0; // Minimum tilt angle
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TILT_MAX = 90; // Maximum tilt angle
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TILT_DETENT_INTERVAL = 15; // Detent every 15 degrees
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THUMBSCREW_DIAMETER = 10; // M5 equivalent
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THUMBSCREW_DEPTH = 8; // Engagement depth
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// Detent positions: 0, 15, 30, 45, 60, 75, 90 degrees
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DETENT_POSITIONS = [0, 15, 30, 45, 60, 75, 90];
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// ==================== GOPRO INTERFACE ====================
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module gopro_mounting_base() {
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// Base plate that receives GoPro 3-prong connector
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// Dimensions accommodate standard GoPro mounts
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linear_extrude(height = 8) {
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// Main base: 50x35mm
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square([50, 35], center = true);
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}
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}
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module gopro_prong_slot_center() {
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// Center prong slot (larger for main mounting)
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// Slot dimensions: 14.5mm wide x 9mm deep x 12mm tall
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translate([0, 0, 4]) {
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cube([GOPRO_PRONG_WIDTH_CENTER, GOPRO_PRONG_DEPTH + 2, 12], center = true);
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}
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}
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module gopro_prong_slot_side(x_offset) {
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// Side prong slots (two of them, mirrored)
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translate([x_offset, 0, 4]) {
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cube([GOPRO_PRONG_WIDTH_SIDE, GOPRO_PRONG_DEPTH + 2, 12], center = true);
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}
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}
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module gopro_interface_slots() {
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// All three prong slots for GoPro mount
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gopro_prong_slot_center(); // Center
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gopro_prong_slot_side(GOPRO_PRONG_SPACING / 2); // Right
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gopro_prong_slot_side(-GOPRO_PRONG_SPACING / 2); // Left
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}
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module gopro_mounting_assembly() {
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difference() {
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gopro_mounting_base();
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gopro_interface_slots();
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}
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// Add retaining tabs (small lips to keep mount from sliding out)
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translate([0, GOPRO_PRONG_DEPTH/2 + 1, 7]) {
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cube([50, 2, 2], center = true);
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}
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}
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// ==================== TILT MECHANISM ====================
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module tilt_pivot_pin() {
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// Central pivot for tilt adjustment
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// M8 equivalent bolt hole with shoulder
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// Main pin body
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cylinder(h = 40, r = TILT_PIVOT_DIAMETER/2 + 1, $fn = 32);
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// Bolt hole through center
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cylinder(h = 42, r = 2.2, $fn = 16, center = true);
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}
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module detent_pocket(angle) {
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// Spherical detent pocket at specific angle
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// Located on tilt arm, engages with detent spring ball
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sphere_r = 2;
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translate([0, 0, 15]) {
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rotate([angle, 0, 0]) {
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translate([0, TILT_PIVOT_DIAMETER/2 + 4, 0]) {
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sphere(r = sphere_r, $fn = 16);
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}
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}
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}
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}
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module detent_pockets() {
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// Create all detent pockets for 0-90 degree range
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for (angle = DETENT_POSITIONS) {
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detent_pocket(angle);
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}
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}
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module tilt_arm() {
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// Arm that connects GoPro mount to T-slot clamp
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// Rotates around pivot pin for tilt adjustment
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// Main arm structure (tapered for strength)
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hull() {
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// Top section (connects to GoPro mount)
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translate([0, 0, 35]) {
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cube([40, 25, 10], center = true);
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}
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// Bottom section (connects to T-slot clamp)
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translate([0, 0, 0]) {
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cube([35, 20, 8], center = true);
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}
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}
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}
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module tilt_mechanism_assembly() {
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// Pivot pin at center
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translate([0, 0, 8]) {
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tilt_pivot_pin();
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}
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// Tilt arm with GoPro mount
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translate([0, 0, 8]) {
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rotate([0, 0, 0]) { // Default position: 0 degrees tilt
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difference() {
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union() {
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tilt_arm();
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gopro_mounting_assembly();
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}
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// Pivot hole
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translate([0, 0, -5]) {
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cylinder(h = 50, r = 2.2, $fn = 16);
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}
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}
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}
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}
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// Detent ball pockets (visible for assembly reference)
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translate([0, 0, 8]) {
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detent_pockets();
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}
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}
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// ==================== THUMBSCREW RETENTION ====================
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module thumbscrew_mechanism() {
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// Thumbscrew for locking tilt position
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// M5 equivalent (10mm head)
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// Engagement hole on tilt arm
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translate([15, 0, 20]) {
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cylinder(h = THUMBSCREW_DEPTH + 2, r = THUMBSCREW_DIAMETER/2 + 0.5, $fn = 16);
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}
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}
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// ==================== T-SLOT CLAMP ====================
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module tslot_clamp_base() {
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// Base connector for T-slot mounting
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// Similar to phone mount but simplified for GoPro (lighter load)
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linear_extrude(height = 12) {
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square([25, 25], center = true);
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}
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}
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module tslot_mounting_holes() {
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// M4 bolt holes for T-nut attachment
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hole_inset = 7;
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translate([hole_inset, hole_inset, -1])
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cylinder(h = 14, r = 2.2, $fn = 16);
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translate([-hole_inset, hole_inset, -1])
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cylinder(h = 14, r = 2.2, $fn = 16);
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translate([hole_inset, -hole_inset, -1])
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cylinder(h = 14, r = 2.2, $fn = 16);
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translate([-hole_inset, -hole_inset, -1])
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cylinder(h = 14, r = 2.2, $fn = 16);
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}
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module tslot_clamp_assembly() {
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difference() {
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tslot_clamp_base();
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tslot_mounting_holes();
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}
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}
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// ==================== PIVOT HOUSING ====================
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module pivot_housing() {
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// Connects T-slot clamp to tilt mechanism
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// Houses the pivot pin
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translate([0, 0, 12]) {
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// Main housing body
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||||||
|
cube([30, 30, 15], center = true);
|
||||||
|
|
||||||
|
// Pivot socket (receives pivot pin)
|
||||||
|
translate([0, 0, 2]) {
|
||||||
|
cylinder(h = 10, r = TILT_PIVOT_DIAMETER/2 + 1.5, $fn = 32);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
module pivot_housing_assembly() {
|
||||||
|
difference() {
|
||||||
|
pivot_housing();
|
||||||
|
|
||||||
|
// Clearance hole for pivot pin
|
||||||
|
translate([0, 0, 10]) {
|
||||||
|
cylinder(h = 20, r = TILT_PIVOT_DIAMETER/2 + 0.2, $fn = 32);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// ==================== COMPLETE ASSEMBLY ====================
|
||||||
|
|
||||||
|
module complete_gopro_mount() {
|
||||||
|
// Fixed base: T-slot clamp
|
||||||
|
tslot_clamp_assembly();
|
||||||
|
|
||||||
|
// Pivot housing
|
||||||
|
pivot_housing_assembly();
|
||||||
|
|
||||||
|
// Tilt mechanism with GoPro mount
|
||||||
|
tilt_mechanism_assembly();
|
||||||
|
|
||||||
|
// Thumbscrew engagement hole marker
|
||||||
|
thumbscrew_mechanism();
|
||||||
|
}
|
||||||
|
|
||||||
|
// ==================== RENDER ====================
|
||||||
|
complete_gopro_mount();
|
||||||
|
|
||||||
|
// Visualization aids (comment out for export):
|
||||||
|
// Show tilt range visualization
|
||||||
|
// translate([80, 0, 0]) rotate([15, 0, 0]) complete_gopro_mount();
|
||||||
|
// translate([160, 0, 0]) rotate([90, 0, 0]) complete_gopro_mount();
|
||||||
|
|
||||||
|
// Show T-slot envelope
|
||||||
|
// %translate([0, 0, 0]) cube([20, 20, 30], center = true);
|
||||||
Loading…
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Reference in New Issue
Block a user