Backlash Belt Test

prusaprinters

<p>The carriage has a short and long side (around the pulley) end of belt - if there is a difference in the gaps left and right side. Your belt is too elastic or broken. Or there is too much resistance. This <a href="https://en.wikipedia.org/wiki/Backlash_(engineering)">backlash</a> will causes problems with clearances.&nbsp;</p><p>In spiral mode the upper side is printed in one direction while the lower side tensions the other side of the belt when moving the extruder.</p><p>To stabilize the print there is a top to connect the sides so it will bend less.</p><p>Print this for X and for Y 90° rotated, position the print near the motor on the bed so the short end is short as possible because that is where deviations are biggest.</p><h3>Results</h3><figure class="image image-style-align-right image_resized" style="width:75%;"><img src="https://media.printables.com/media/prints/276065/rich_content/01c6da27-54f9-473e-a4ae-4518c74f3115/dsc0496722-266gauge.jpg#%7B%22uuid%22%3A%22b09c0606-3162-4db3-84d9-b3e2e187dca4%22%2C%22w%22%3A1109%2C%22h%22%3A832%7D"></figure><p>here you see signs of a bad belt (over tensioned causing resistance). The gaps on the left side (of the lower row triangles) &nbsp;are much bigger than on the right, because the carriage lagged more behind when pulled from the other side. A loose belt will show similar signs as there is play in the movement.&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><h3>Wanted Results</h3><figure class="image image-style-align-left image_resized" style="width:75%;"><img src="https://media.printables.com/media/prints/276065/rich_content/469eeb4f-9c64-496e-bfce-76612b70e58f/dsc0496922-266gauge.jpg#%7B%22uuid%22%3A%22fa7a98d8-f079-4a63-a540-b0b53401ab79%22%2C%22w%22%3A1440%2C%22h%22%3A1080%7D"></figure><p>&nbsp;</p><p>&nbsp;Here you see more equal spaced sides, but still not perfect.</p><p>(you also need to look perpendicular or just print 2 layer)</p>