I updated to Ultimaker 4.2.1 and now a model that I created in 2018 and I am printing every few weeks isn´t printing anymore.
When slicing, it just prints a Tower and useless support structures :
-> this is the model x2 before preparation :
and this is the simulated print :
-> the Model is completely ignored and there are just useless support structures printed
what could be the reason ?!
I exported it again as .stl from the model, but nothing changes this situation.
I can print every other model without proble