Having said what I said above, you could try going into the Custom settings, and find the "Union Overlapping Volumes" setting (use the Search!), and turn it off. But it is much better to make proper models.
Edited by ahoebenHaving said what I said above, you could try going into the Custom settings, and find the "Union Overlapping Volumes" setting (use the Search!), and turn it off. But it is much better to make proper models.
Edited by ahoeben
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ahoeben 1,981
You don't.
A proper hollow model for 3d printing has walls that have a thickness, ie: inner and outer walls.
If you wanted to print that AUDI-logo-like model, you would create 3 tubes with inner and outer walls (and a top and bottom), and then properly union them. Otherwise you will have a model that confuses any slicer.
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geert_2 558
This are 3 separate rings. Probably you would need to "union" them in your CAD program, so it becomes one single object.
Edit: while I was still typing, ahoeben already answered. Speed is everything. :-)
But he is right: it is best to design the wall thickness in your CAD-program too. Don't leave such things to the guessing of automatic tools which don't know the meaning or purpose of your model, nor your wishes. So they have to make generalised guesses.
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