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Super n00b question for n00bz

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So... how do I make sure my design is the right size? There are rulers and stuff in TinkerCAD (all the free software I've amassed and I still play with that the most, oops) but they don't have a unit, just numbers. Is it mm? in? cm? kilometers? Or is that something that gets sorted in the slicer program? I don't have my printer yet but when I get it, it's got a pretty specific set of dimensions it can do so I'm trying to make sure stuff I design fits into it.

most of the time it's in mm
that is like the default for this

Tinkercad actually lets you specify UoM. It defaults to mm. The lower right corner will let you adjust the snap resolution. It'll show the current UoM

Yup, just looked. The 'Edit Grid' in the lower right lets you choose UoM