Bolt Action Pen

bolt action penRequire:1x M3*5mm hex bolt1x pen spring2x Pilot g2 gel ink refill (same size would work) Might have to sand the printed bolt a bit to have better tolerances, I printed this on the A1 mini and had no problemUse a drill or knife to enlarge the pen tip hole slightly, purposely left smaller to avoid pen tip from wiggling when writing