Sleeve for La Cimbali coffee grinder hopper

prusaprinters

<h3>The broken part</h3><p>The polycarbonate hopper that has fallen one time too many:</p><figure class="image"><img src="https://media.printables.com/media/prints/299100/rich_content/020a0ffd-66c0-4b57-9717-e90b34188568/image.png#%7B%22uuid%22%3A%22f4fec60c-dbe4-422b-ac2e-32d73888417a%22%2C%22w%22%3A1774%2C%22h%22%3A1493%7D"></figure><h3>&nbsp;</h3><h3>The fix</h3><p>&nbsp;</p><ul><li>The sleeve <strong>slides</strong> on top and encloses the original part.</li><li>The top perimeter reproduces the original features, thus <strong>allowing the existing lid</strong> to be used.</li><li>A window facing the front of the machine has been designed to <strong>monitor the level</strong> of beans left.</li><li>The fit is loose to allow <strong>easy cleaning</strong>.</li></ul><figure class="image"><img src="https://media.printables.com/media/prints/299100/rich_content/97e74f8a-5e28-43e1-bfe3-6ff2e5095596/image.png#%7B%22uuid%22%3A%220fe6706e-10f0-4a8b-abb7-5622a0793456%22%2C%22w%22%3A1847%2C%22h%22%3A1099%7D"></figure><p>&nbsp;</p><h3>Implementation details</h3><p>&nbsp;</p><p>Designed using OpenSCAD. The cutout curve was done swiftly thanks to this <a href="https://openhome.cc/eGossip/OpenSCAD/BezierCurve.html">simple Bezier curves</a> code.</p><p>Matching the curves and the various features of the hopper proved more <strong>tricky</strong> than I initially thought. I converged on a nice fit through a series of <strong>draft prints</strong> focusing on different areas.</p><p>Low definition drafts:</p><figure class="image"><img src="https://media.printables.com/media/prints/299100/rich_content/a68a0844-017b-4e48-80b3-0a04853a610b/image.png#%7B%22uuid%22%3A%22b725bb0f-f0a9-45f5-ad3a-09e8de5cc312%22%2C%22w%22%3A1600%2C%22h%22%3A1200%7D"></figure><p>Details of the underside:</p><figure class="image"><img src="https://media.printables.com/media/prints/299100/rich_content/326d617f-3eca-47c6-9ff9-77e0b18b0d49/image.png#%7B%22uuid%22%3A%22afc2d2c6-9c2b-4860-85f9-979137cc87fb%22%2C%22w%22%3A1650%2C%22h%22%3A1119%7D"></figure><h3>Printing</h3><p>This print requires support to guarantee the best fit.</p><p>On the Mk III S3+, it prints in 22h using the stock <i><strong>QUALITY</strong></i> setting (0.2mm Layer Height).</p><figure class="image"><img src="https://media.printables.com/media/prints/299100/rich_content/a376913e-7db8-4abd-820c-08f5f3b6ff5e/image.png#%7B%22uuid%22%3A%22b1467694-e6f9-483d-937b-49f1373ef470%22%2C%22w%22%3A2227%2C%22h%22%3A1275%7D"></figure><p>A view of the model for reference: “La Cimbali Junior Grinder”</p><figure class="image"><img src="https://static.wixstatic.com/media/452b80_c1e6c147ecc54726a26e4e5fc4793ee5~mv2_d_2811_2811_s_4_2.jpg/v1/fill/w_2811,h_2811,al_c,q_85/452b80_c1e6c147ecc54726a26e4e5fc4793ee5~mv2_d_2811_2811_s_4_2.jpg" alt="La Cimbali &quot;Junior&quot; Espresso Grinder -- sold | voltage110"></figure>