Bolt action pen

This is a simple two-part bolt action pen that I made to fit most pen cartridges you have at home.For this you will need:one M3x6mm bolt one pen cartridge with a 2.85 mm diameter one spring from a clicking ballpoint pen I recommend printing the model first and then cutting your cartridge to size.Also if your spring feels too stiff then cut one of the ends but if it is too short then stretch it and it will be softer.