Rapid prototyping in use
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Flip to reveal answersName the five checks that make a CAD model printable.
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Question
Name the five checks that make a CAD model printable.
Answer
Watertight solid, wall thickness against the nozzle or beam width, orientation, overhangs and reachable supports, and designed clearances at mating faces.
Question
Why does orientation come first?
Answer
It fixes which faces print well, which surfaces overhang and need support, and the direction the part is weak in — so every other decision depends on it.
Question
What clearance do mating printed parts need?
Answer
Typically 0.2 to 0.4 mm per mating face. Modelled at the exact nominal size, printed parts come off the bed fused together.
Question
Why is surviving a test on a printed part weak evidence?
Answer
A printed part is not the production part: FDM is far weaker across its layers than a moulded part is in any direction, and SLA embrittles in sunlight.
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Topic 6.2 hub
Modelling and prototyping
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