Printed the pen upright with brim raft for better adhesion and the bolt sideways so that it would not break when the screw is installed

I used an m3 screw for the bolt to 'trigger' the pen and a random screw laying around for the top so when I install the new ink I can just press on the top screw and screw in the m3 screw locking the bolt in place

the ink that I'm using is the zebra jf 0.5 refill, which should be easy to get and quite affordable