these are pretty cool, but for some reason some of them do not print right without supports, Using cura or prusa to slice. I have to add supports to keep it from failing. on mid 5 for sure i am having the worst problems. if you upload it into cura and slice, then preview it tries to build the start of the threads with nothing under it. I cant figure out how to fix it lol. mid 5 is the easiest to add designs to, so that's why i was needing it to work soo bad, but couldn't figure it out. i even tried adding a tube through the middle in tinker cad so it would build a support as it printed and that didnt work. I'm stumped. I would just add the tree support, but I'm trying to make a nice print out of exotic filament with it, and don't want any marks on the outside. and it is really hard to get the support out of the middle of the piece lol. Ill upload a picture of what im talking about. this is just dropping your stl straight into cura. so no matter what i have tried it just wont print withought really messy supports.

Mouth 8 will not fit mid 5.