Recommended unit settings for 30×30×2 cm model?

About the model, which is basically one huge solid:

  • Size: ca. 30×30×2 cm

  • Smallest features, e.g. chamfers: ca. 1 mm

Unit settings:

  • Model units: Millimeters

  • Absolute tolerance: 0.001

  • Relative tolerance: 1.0

  • Angle tolerance: 1.0

Constantly I am running into problems with naked edges when adding features to the solid. I fix them in one place, and then they come up in another place - a nightmare. Once, I think when doing a boolean operation, I got a message that the tolerance had to be doubled to finish the operation. I ignored that and continued working.

It could of course be that I made some mistakes, or I didn’t edit in a smart way, but just to be on the safe side:

Given the model’s dimensions, are my settings OK?

File units in mm? I think it’s OK…

My preference is for a tighter angle tolerance of 0.1 (the angle at which you consider things to be “tangent”, I find 1 degree to be far too much)

I don’t know what you are doing when you “add features to the solid”, but if you are getting a lot of naked edges, there’s something wrong… Often it has to do with how you are trimming/splitting and adding stuff, which is where edges get out of tolerance. Always check for naked edges while you’re modeling…

Maybe some of this might help…


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I don’t know if it will affect naked edges but I usually use a relative tolerance of 0.01 or smaller. I also use an angle tolerance of 0.1 or 0.01.

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Hi Felix- the settings look fine to me- can you give me an example of an operation that leaves you with unexpected nakeds? Can you send the file? (, to my attention)


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Thanks for the advice - that was exactly what I was looking for!

Without changing my settings, I finally was able to iron out all issues. From time to time I have to reconstruct some surfaces if there are problems with naked edges.

Attached is a part of the model, which shows level of detail.

cover.3dm (1.4 MB) [quote=“Helvetosaur, post:2, topic:7806”]
I don’t know what you are doing when you “add features to the solid”
With features I mean details, such as a hole for a screw.