[Prusa] Box Quick Remove Corner with Compression Spring

prusaprinters

<p>This is a remix of the original beta quick remove corners for the Printer-Box.com Prusa Box. &nbsp;The original parts featured a molded spring that is intended to push the upper corner legs out just enough to clear the mounting screws on the bottom case. &nbsp;Unfortunately, as many people have found and the company has documented on their facebook group, the molded spring feature breaks after a few cycles.</p><p>My way of fixing this was to remove the molded spring feature, fill the void, and add a hole to accept a compression spring that approximates the original design intention. &nbsp;</p><p>I didn't want to waste my already printed parts so I designed a filler block. &nbsp;I cut out the molded spring features on my original parts using an Xacto blade and cleaned up the rectangular cavities with a needle file. &nbsp;Then just insert the filler, place a spring in the hole, and use the parts as normal just as Printer-Box.com describes on their website and videos.</p><p>You could choose to reprint the entire corner parts instead of using the fillers. &nbsp;I provide you both files so you can choose. &nbsp;I have tested both and they are identical in functionality.</p><p>The important part is the spring. &nbsp;I measured the force applied by the original molded spring feature and it averaged about 5 lbs for a displacement of 0.125 in. &nbsp;This gives a spring rate of about 40 lbs/in. &nbsp;The compression spring I chose from McMaster-Carr.com is model 9657K608, 0.25" long, 0.210" OD, and comes in a pack of 12 which provides you what you need plus a few spares. &nbsp;The spring fits in a hole that is 0.125" (3.175mm) deep to expose 0.125"(3.175mm) of the spring. &nbsp;The hole is centered where the original contact point was.</p><p><strong>What you need</strong></p><ul><li>Print either the filler pieces (8 total) or the entire corner pieces (4 total)</li><li>8 springs, McMaster-Carr part number 9657K608.</li></ul><p><strong>Print Settings</strong></p><ul><li>Filler pieces: &nbsp;PETG, 20% infill. &nbsp;Orient the hole facing up, no supports.</li><li>Corner pieces: &nbsp;original design calls for PETG, 60% infill. &nbsp;Print standing up as shown, no supports.</li></ul><p><strong>Reference Links</strong></p><p><a href="https://www.printer-box.com">https://www.printer-box.com</a></p><p><a href="https://www.facebook.com/groups/printerboxusers/">https://www.facebook.com/groups/printerboxusers/</a></p><p><a href="https://www.mcmaster.com">https://www.mcmaster.com</a></p><p>&nbsp;</p>