As quotedd I want to print a hollow objecct (see pictures). I was already able to print that one without support structure but the result wasn't really satisfying at some points, therefore I thought modeling a supportive structure inside the object could help. Unfortunately, when slicing the model the modeled structure is totally gone and I'm asking myself why this is happening.
I'm quite new into 3D printing and thankful for any advise.
Thanks in advance