3D Models

Complete 3D models of the Moto32 PCB for enclosure design, mechanical integration, and visualization.

Download 3D Files

3D Model Overview

The 3D STEP file includes:

• Complete PCB outline and thickness
• All component 3D bodies with accurate dimensions
• Mounting hole positions and sizes
• Connector positions and keepout zones
• Component heights above PCB
• Clearance requirements

Mechanical Specifications

PCB Dimensions

Mounting Holes

Specifications:

• Diameter: Typically M3 (3.0mm clearance, 3.2mm recommended)
• Quantity: 4 holes (one in each corner)
• Purpose: Secure PCB to motorcycle frame or enclosure

Recommended Hardware:

• M3 screws (10-16mm length depending on standoff)
• M3 nylon or metal standoffs (8-10mm height)
• M3 washers (optional, for vibration dampening)
• Rubber grommets (recommended for vibration isolation)

Component Heights

Maximum component heights above PCB:

Total Assembly Height:

• Top side: ~5mm (with crystal) or ~3.5mm (without)
• Bottom side: ~1mm (minimal components)
• Total clearance needed: 6-7mm above PCB top

Connector Positions

USB-C Connector:

• Location: Edge of PCB
• Orientation: Horizontal (cable exits parallel to PCB)
• Clearance needed: 15-20mm for cable bend radius
• Access: Must be accessible for programming and serial communication

Power Input / Output Connectors:

• Location: Varies (add as needed)
• Options:
  • Screw terminals
  • Wire pads with direct soldering
  • Molex/Deutsch automotive connectors

Using the 3D Model

Compatible CAD Software

The STEP (.step / .stp) format is universal and works with:

Importing the Model

General Steps:

1. Download 3D_File.step from repository
2. Open your CAD software
3. Import/Open STEP file
4. Model appears as assembly with all components
5. Use as reference for your enclosure design

Tips:

• Model is to scale (1:1)
• Component bodies are simplified for performance
• All critical dimensions are accurate
• Use for fitment checks and clearance verification

Enclosure Design

Design Considerations

When designing an enclosure for Moto32:

Protection Requirements:

• Water resistance: IP65 or better recommended
• Dust protection: Sealed against road dust and debris
• Impact resistance: Protect from vibration and minor impacts
• Heat dissipation: Ventilation or thermal conduction for MOSFETs

Access Requirements:

• USB-C port accessible for programming
• Wire entry/exit points for power and outputs
• Optional: Status LED light pipes
• Optional: Button access for reset/boot

Mounting:

• Standoffs to isolate PCB from enclosure bottom
• Rubber vibration dampeners
• Secure mounting to motorcycle frame
• Cable strain relief

Enclosure Materials

Example Enclosure Design

Simple 3D Printed Enclosure:

Top view:
┌────────────────────────────┐
│         [USB port]         │
│                            │
│    ┌────────────────┐     │
│    │   Moto32 PCB   │     │
│    │   (on standoffs)│    │
│    └────────────────┘     │
│                            │
│ [Wire entry gland]         │
└────────────────────────────┘

Side view:
     ┌─ Lid
     │
─────┴──────────────  ← Seal (O-ring or gasket)
     │  PCB
═════════════════  ← Standoffs
     Bottom

Features:

• 5mm clearance above tallest component
• M3 mounting holes align with PCB
• USB-C cutout in side wall
• Cable gland for wire entry (waterproof)
• Snap-fit or screw-on lid
• Optional gasket groove for sealing

3D Printing Settings

For printing your enclosure:

Recommended Settings:

• Material: PETG or Nylon (heat resistant)
• Layer height: 0.2mm
• Infill: 20-30%
• Walls: 3-4 perimeters
• Top/Bottom: 5 layers minimum
• Supports: Only where necessary

Post-Processing:

• Clean up support material
• Drill mounting holes to exact size
• Smooth internal surfaces
• Test fit before final assembly

Mounting Solutions

Option 1: Under-Seat Mounting

Most common location for motorcycles

• Protected from weather
• Easy wire routing to battery
• Accessible for maintenance
• Good heat dissipation

Mounting:

• Use existing frame mounting points
• Or add custom bracket
• Vibration-isolating mounts essential
• Secure all connectors with zip ties

Option 2: Behind Headlight

For cafe racer or minimal builds

• Keeps electronics forward
• Shorter wire runs to front lights
• Hidden from view
• May need waterproof enclosure

Option 3: Side Panel Integration

Integrated into custom bodywork

• Clean aesthetic
• Custom fabrication required
• Good for show bikes
• Ensure adequate ventilation

Vibration Isolation

Motorcycles create significant vibration. Protect your electronics:

Methods:

• Rubber grommets in mounting holes
• Foam padding in enclosure
• Silicone dampeners under standoffs
• Wire strain relief prevent fatigue

Thermal Management

Heat Sources

Components that generate heat:

• Buck converter (U3): ~1W dissipation
• MOSFETs (Q5-Q12): 0.5-1W each under load
• ESP32 module: 0.5W typical

Total heat: 5-10W depending on load

Cooling Solutions

Passive Cooling (Recommended):

• PCB copper acts as heatsink
• Enclosure conducts heat away
• Ventilation holes (with mesh to keep water out)
• Thermal pads from MOSFETs to enclosure

Active Cooling (Rarely Needed):

• Small 12V fan for extreme conditions
• Liquid cooling not necessary

Wiring Harness Integration

Connector Strategy

Internal PCB Side:

• Solder wires directly to PCB pads, OR
• Add screw terminals, OR
• Use board-to-wire connectors

External (Motorcycle Side):

• Deutsch automotive connectors (waterproof)
• Weatherpack connectors
• Spade terminals with heat shrink
• Avoid exposed terminals

Cable Management

• Use appropriately sized wire (14-16 AWG for power)
• Color code wires (standard motorcycle colors)
• Label both ends of every wire
• Use split loom or heat shrink for protection
• Strain relief at enclosure entry
• Keep high current and signal wires separated

Bill of Materials - Enclosure

For DIY Enclosure:

Alternative - Off-the-shelf Box:

• Hammond 1590BB or similar
• Waterproof ABS project box
• Pelican-style case (if space allows)

CAD Resources

Learning Resources

Fusion 360 Tutorials:

• Autodesk's official tutorials
• YouTube: "Fusion 360 for beginners"
• Focus on: Sketching, extrusion, assembly

FreeCAD Tutorials:

• FreeCAD official documentation
• Part Design workbench basics
• Creating enclosures and mounting brackets

Community Designs

Share your enclosure designs:

• Upload to GitHub repository
• Post on Thingiverse or Printables
• Share STL files for community use
• Document your mounting solution

Next Steps