Machininst's Parallel Bar Set
thingiverse
In machine shop environments, parallels are employed to facilitate measuring or holding workpieces in drill presses or milling machines with precision. Typically, they are crafted from steel machined to strict tolerances (link to an Amazon version for reference: http://amzn.to/28PGxhU). I have discovered that my 3D printer produces satisfactory results, enabling me to create a cost-effective and disposable set for home use at minimal expense. The bars feature dimensions of 3/16" in thickness, 4-1/2" in length, and vary in width from 3/8 to 1 inch in increments of 1/8 inch.
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