Summary

This is an openscad model that prints out a holder for a razor blade at a specific angle that you can specify when you print. It uses a single flat razor blade:

Logan 270 Matte Cutter Blade

https://www.amazon.com/gp/product/B0000AE6BL/

and a bolt/nut that allows for depth adjustments. I just rummaged through my bolts to find one that would fit, but it is probably like an M2 or something like that. It will just fit through the slot on the razor. The nut catches on the back side so you can easily loosen the bolt to slide the blade up and down to adjust the depth.

In the code, set the value of:

angleOfCut = 75;//This is the angle that matters

in the OpenScad file to adjust for different angles. Then just print it.

It uses the threads.scad library for screws that stick out the back that allow you to adjust the distance to a ruler if you need it (I used it to cut the ailerons on an airplane at a constant width). You may have to tap it if the threads don't print well.

I did something like 3 shells and 25% infill.

Note that the geometry starts to break down for angles less about 50 degrees (where 90 is vertical). You may have to tweak the code to get the razor slot depth to be correct.