The fit only model is just what fits the pen's barrel to use as refrence

the other ones are ideas I wanted to try wether they work or not, I don't know yet!

I'm going to print them soon, I have more ideas on how to make a more uniform ink if my idea works

the feed works when printed out of plastic actually with 0.15mm tolerances (the .stl file) but it's very hard to print and doesn't work that great.

the STL is with 0.15mm tolerances already reduced for FDM. can be printed with supports laying on the bottom but it won't be that great.

the fusion files are 1:1 without tolerances anywhere.xz