Universal 3:1 Geared knob

prusaprinters

<p><strong>Things I improved from the original desing:</strong></p><ul><li>a bit bigger tolerances for smoother motion</li><li>removed the “lip” at the bottom of the Knob Gear so it's easier to assemble</li><li>increased the size of the hole in the Knob Gear (the orignal one didn't fit the encoder)</li><li>increased the size of the hole in the Planet Gears from 3 to 4 mm</li><li>changed the profile of Planet Gears a bit, so they fit together with more clearance&nbsp;</li><li>added a base that utilises the M8 thread on the rotary encoder</li><li>changed the text form “prusa” to “ 3x faster” to make it look “universal” and mark which knob is meant for fast scrolling</li></ul><p>Only modification that you'll need to do to your LCD enclousure is to enlarge the hole to 12mm (I recommend to make it a bit bigger), so the base can screw onto the encoder.&nbsp;<br><br>The pins in the Base for Planet Gears have small holes through them, because I found that it helps to maintain the right dimensions on small details like that. You can put in them some filament and a CA glue to cover the holes and strenghten the pins.</p><figure class="image image_resized image-style-align-center" style="width:50%;"><img src="https://media.printables.com/media/prints/242829/rich_content/226eb789-8895-4000-abdb-06cf06cc50c4/img_20220716_125322.jpg#%7B%22uuid%22%3A%22c1199d2c-d59c-4f2f-9224-3b0831770a55%22%2C%22w%22%3A4640%2C%22h%22%3A3472%7D"></figure><p><br><strong>Assembly:</strong></p><ol><li>Screw the Base onto the encoder<br><img class="image_resized" style="width:50%;" src="https://media.printables.com/media/prints/242829/rich_content/771544b7-709e-4e06-a02c-3d6afdab74bd/img_20220716_130807.jpg#%7B%22uuid%22%3A%221d7ebe3e-4961-465b-a4f9-d71a0ee5942f%22%2C%22w%22%3A4640%2C%22h%22%3A3472%7D"><br>&nbsp;</li><li>Put on the pair of Planet Gears (flat side facing the base)<br><img class="image_resized" style="width:50%;" src="https://media.printables.com/media/prints/242829/rich_content/9ab42e69-aff1-44fb-8b28-330525db8b41/img_20220716_130833.jpg#%7B%22uuid%22%3A%220d65b3d5-9017-45c1-85f7-06fbd6da233f%22%2C%22w%22%3A4640%2C%22h%22%3A3472%7D"><br>&nbsp;</li><li>Put on the Outer Knob and while holding it centered on the gears insert the Knob Gear onto the encoder<br><img class="image_resized" style="width:50%;" src="https://media.printables.com/media/prints/242829/rich_content/78ef43f0-2790-463d-a150-fc9c55baa7f2/img_20220716_140459.jpg#%7B%22uuid%22%3A%222aeb7e34-b792-4f1d-94cb-f394ad268108%22%2C%22w%22%3A4640%2C%22h%22%3A3472%7D"><br>&nbsp;</li><li><strong>Done! </strong>Now you can quickly scroll using the big knob and do fine adjustments with the smaller one!</li></ol>