Square measuring tool for tape measure
thingiverse
The best way to check for square is to measure opposing corners for equal distance. Using a tape measure is the common method but the tape will often not stay on the corner well. This will hold the tape measure in place with less tension required. Update two object where off platform by 1mm. Corrected and uploaded level version. Instructions Use a #12 machine screw with 2 washers and a nylock nut to secure two parts. Do not over tighten to allow the tape measure holder to swivel.
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