Designing parts with threaded inserts or assembly features requires planning for manufacturing and functionality:
1. Threaded Inserts (Recommended Method)
Heat-Set Inserts — Design holes 0.1-0.2mm smaller than insert outer diameter. Inserts are pressed in with a soldering iron after printing. Provides strong, reusable metal threads. Best for repeated assembly/disassembly and high-load applications.
Press-Fit Inserts — Design holes slightly undersized for interference fit. Insert pressed in manually or with arbor press. Good for lower-load applications and permanent assemblies.
2. Design Tips for Inserts
Add chamfers to hole openings for easier insertion
Provide at least 3-4mm of material depth around the insert
Orient holes vertically (Z-axis) during printing for best results
3. Printed Threads (Not Recommended)
Printing threads directly is possible but:
Weak and prone to stripping
Requires post-processing (tapping) for reliability
Only suitable for very low-load, occasional use
4. Assembly Features
Snap-Fit Joints — Use flexible materials like PETG or Nylon. Design with 15-20° lead-in angles. Account for material deflection.
Alignment Features — Add pins and corresponding holes for precise alignment. Use 0.2-0.4mm clearance for FDM parts.
Interlocking Parts — Design mating surfaces with 0.3mm clearance minimum. Test fit with a prototype before final production.
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