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maxmade

How to print hollow, intersecting, open objects (AUDI rings)

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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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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.

Edited by geert_2

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