Cutting guide for your bicycle fork's steerer tube. Inside diameter is 29.1 mm, and the thickness of the blade slot is 2 mm.
This should work with most common ceramic/carbon cutting blades. There's a small insert that can be used to ensure equal spacing after inserting a cutting blade is inserted into the cutting guide.
I've included a STEP file in case you want to modify some dimensions or other aspects.
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The author marked this model as their own original creation.