I loved this cutter created by LToyCreations (https://www.thingiverse.com/thing:1543522), but in general, if I have something that should remain on my printer table, it will inevitably find a way to not be available when I need it. I went ahead and remixed it to allow it to be mounted to any 2020 extrusion.
1 x Compression Spring (5/16" x 1-1/2" x .020") or (7.94mm x 38.10mm x 0.50mm)
1 x Set Screw (Slotted 4-40 x 3/16") or (Hex M3 x 3mm)
1 x Screw: M3-.50 x 18
1 x Blade: 9mm Snap-off blade
2 x Screw: M3x10
2 x M3 T-nut