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Thread clearance test
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Print these with no support material. The numbers on the bolts represent the clearance between the bolt and the nut in millimeters. The numbers on the nut are just so you can keep track of which nut goes to which bolt. Most consumer grade printers cannot print with a clearance of 0.1 millimeters but 0.2 should work fine. I found the most luck with 0.3 millimeters on my Ender 3. The bolts are standard 16x2 bolts.
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