Rollerball Pen

Thread is working and running smooth. The cap is also working. Note that the parts are printed in medium to high quality. Maybe you have to make some adjustmets in the autodesk files to make it working with low quality.
This pen is designed for the following ball pen refill: (Pilot G2 refill)

https://www.ebay.com/itm/10pcs-Pilot-G-2-0-38-roller-ball-pen-only-refill-red-/361534983796?roken=cUgayN&soutkn=qIoIgw

but probably all rollerball refills are working, try it and give feedback! :)