XACTO Blade Pen

thingiverse

I'm having trouble describing this thing, but it's an XACTO blade pen holder that fits snugly under a 9mm wide blade. Threading the cap onto the pen can be a bit tricky at first - it was for me. I found it helpful to use two pliers to guide the cap into place and repeat the process until the cap comes off easily by hand. The reason for this difficulty might be my printer's resolution, so you may have an easier time with yours.