3D Printing Workflow

Designing for Printing

35 分

Designing for the process gives stronger, cleaner and faster prints.

Rules of thumb (FDM, 0.4 mm nozzle)

Feature Guideline
Wall thickness multiples of the line width (0.8, 1.2, 1.6 mm)
Minimum feature about 0.8 mm for reliable details
Overhangs up to ~45° without support; use chamfers instead of flat overhangs
Bridges short horizontal spans (a few cm) can bridge without support
Holes print slightly undersized; design a little larger or drill/ream afterwards
Text embossed text at least ~0.6 mm high and with bold fonts

Self-supporting design tricks

  • Replace horizontal overhangs with 45° chamfers.
  • Use teardrop-shaped horizontal holes so their tops are self-supporting.
  • Split complex parts into simpler pieces that each print flat, joined with pins, dovetails or screws.

Fasteners

  • Heat-set threaded inserts give strong, reusable metal threads in plastic.
  • Captive nut pockets hold standard nuts.
  • Printed threads work for large, coarse threads.

Strength

  • Fillets at inside corners reduce stress concentration.
  • Orient so forces act along layers; add walls rather than infill.
  • Avoid thin, tall features that wobble during printing.

CAD for functional parts

Parametric CAD (Fusion, Onshape, FreeCAD) makes it easy to change a dimension and regenerate the part, which is ideal for brackets, enclosures and mounts. Blender suits artistic shapes.

Exercise

Design a wall-mounted phone holder in CAD that prints without supports: chamfered overhangs, teardrop screw holes, fillets for strength and a parametric phone width. Print and test it.

Check yourself

  • Why replace flat overhangs with chamfers?
  • What are heat-set inserts used for?
  • When is parametric CAD better than Blender?

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