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When I design parts that must fit in each other, I usually keep in mind that prints are 0.2-0.5 mm wider than expected (depending on the material), and I size the parts accordingly.

However, sometimes, I design the whole part and then slice it with planes or lines. In these cases, I need to push/pull each contact surface manually by the same amount (0.2-0.5 mm), which is a time-consuming task. Another option is to use a cutter to remove the outer surface layer (basically, I remove the rigged surface, making it smooth again). Still, it's unsafe and even more time-consuming.

How can I quickly generate said controlled gaps on the contact surfaces between two objects but not on the rest of the object? To make it everywhere, I could use shells, I guess, but I don't need that on the whole object.

Bob Ortiz
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FarO
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2 Answers2

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Unfortunately, 123D Design doesn't have such a feature.

You could select multiple surfaces and push/pull them all at the same time though.

Remember, your 3D Printer's slicer should have an option to undersize or oversize holes and walls, to help reduce/remove the effect you talk about. It's called size correction, I think? Simplify3D Has it, atleast. You might have to tweak this for every filament type, though.

Alucard Pawpad
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AFAICT Push/Pull faces is the closest thing to what you're looking for. eg:

In OnShape there is an "offset face" command that allows applying such an offset to multiple faces at once: How to add tolerances/gaps in OnShape?

Unfortunately I'm not aware of a way to do exactly the same thing in 123D Design, but I'm far less proficient with that tool (as Alucard Pawpad noted, though, it is possible to just select multiple faces at the same time and manipulate them all together, which is somewhat similar)

Gabriel Grant
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