V1 Better Xacto Knife Handles
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Update 8/18/21 V2.5 is out, which I believe to be even better than the V2:
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Update 8/18/21 V2.5 is out, which I believe to be even better than the V2: https://www.prusaprinters.org/prints/74193-v25-better-xacto-knife-handle
These handles compensate for an Xacto blade's angle, making the cutting edge parallel with the handle. As shown in the second photo, this makes the cutting edge steeper, which is better when doing precision cutting as it keeps the point downward without the need to uncomfortably shift your hand. A resin printer will yield the best results, but I printed this straight up with a brim and it turned out great. Think of the long handle as a usable Z-wobble test for your FDM printer ;)
Use an M2x4mm bolt, M2 washer, and nut to secure the blade. Scale the design up to 103%-104% for FDM printers.
The longer one is more like a traditional Xacto knife. The smaller one, which has a keychain hole, is kind of like using a box cutter blade. I like to carry it on my backpack.