This is a fixture used to cut on the PTFE lining for the SeeMeCNC ends that are popular. It's an adjsutable backstop so you could use it for other things. BOM: PTFE Lining Cutter Foundation & PTFE Lining Cutter Blade Holder (Printed Components), (1) Utility Knife Blade, (2) 6-32 x 2" Machine Screws, (1) 10-32 x 1" Cap Screw, (2) No 4 x 3/8" Sheet Metal Screws, and (2) Suitably sized springs
Printing time is about 2.5 hours for both parts. Source files are contained in the event you need to accommodate this printable.
Attribution - Creative Commons