Foam board 90 degree cutter with depth control

thingiverse

I wanted to have a tool which ensures that my foam board cuts are **perpendicular**, and allows me to perfectly **control the depth** of the cut. So I designed this model that hosts a hobby knife modeling (carving) blade, that can be fully retracted for storage. You can use M2 screws to mount the blade, though I've found it better to slightly enlarge the hole on the blade with my Dremel, and use M3 screws. Then you can apply an M3 knob (tip: there are [tons of them here on Thigiverse](https://www.thingiverse.com/search?q=m3+knob)) on the back, so you can adjust the depth of the cut without any other tool.