Penny Tolerance Test -- No Calipers

prusaprinters

<h3>Penny Tolerance Test -- No Calipers</h3><p>Determine your printer tolerance with a United States penny. If the penny fits, then you've achieved the tested tolerance. If the penny doesn't fit, then your printer is printing too large or small.</p><p>This is useful if you <strong>don't have digital calipers</strong>, but still want a rough idea of how accurately you can print.&nbsp;</p><p>This file should print very fast, with little wasted plastic, so it's easier to iterate your adjustments quickly.</p><h4>Instructions</h4><p>Print out these tests in your desired material. Use your most accurate slicer settings. Print and try the largest size first (+0.10mm). If the penny fits, then try printing the next smaller size down (+0.05mm), etc.&nbsp;</p><p><strong>The penny should fit exactly in the circle, and vertically in the slot</strong>. The penny should be exactly as thick as the print, too.&nbsp;</p><p>Use multiple, new and undamaged pennies. Old pennies won't work because they have <i>slightly </i>different dimensions than new ones.</p><p>If your penny doesn't fit, then you need to:</p><ul><li>&nbsp;calibrate your printer (mechanical, e-steps, z-offset, pressure advance, etc.);</li><li>&nbsp;and adjust your slicer settings (flow, temp, expansion/contraction settings, speed, etc.). &nbsp;</li></ul><h4>Dimension Info</h4><p>Penny size is based on the <a href="https://www.usmint.gov/learn/coin-and-medal-programs/coin-specifications">US Mint's info</a>, not my own measurements.</p><ul><li><strong>Diameter: 19.05 mm</strong></li><li><strong>Thickness: 1.52 mm</strong></li></ul><p>Each model has a +0.XX in the filename and text – this means that the listed dimensions have been enlarged by that amount. For example, the ‘+0.02mm’ model has a hole of 19.07mm, and thickness of 1.54mm.&nbsp;</p><p>The text size is very small, since if you're going for these accurate dimensions, then you should be able to print the text, too. The<strong> text thickness is about 0.6mm</strong> in most places.</p><h4>Notes</h4><p>The Fusion360 and .step files are available, so others can make this model for other coins/sizes.</p><p>Be aware of slicer settings that could impact the print dimensions, such as layer thickness, wall partial merging, etc.&nbsp;</p><p>The thickness of the models overall 1.52mm. Only the circle and slot change dimensions.</p>