Utility blade, marlin spike, speedy sharp, mini pliers.
The pliers don't really fit too well, I had to grind the jaws of them a bit thinner, still needs more work to be able to open one handed, but it works for now, sometimes I need smaller pliers, and I didn't really have any other tools I wanted to use, so that's why I have the pliers on a pliers tool.
The speedy sharp is a knockoff I got, $10 for 10 or something, its a bit thinner than a standard speedy sharp but that was good for this because I didn't have go file it down as much to be able to fit in the tshank. I do end up sharpening the utility blade, the spare is more for when it gets chipped or broken.
Some small 6×0.5mm magnets I had laying around fit perfectly for holding a spare blade.
Side note: does anyone have a 3d model of the pen holder, or know where to get replacements
by Nostrite