This is a fancy pen that uses a cheep cartridge as the ink, like the BIC Round Stic Xtra Life Ballpoint or other similar pen. The fit should be enough to hold the ink cartridge in place. If not, use some glue to keep it in place.
Category: Other
Sorry I don't have a better photo, I gave my model to a friend.
The author marked this model as their own original creation. Imported from Thingiverse.