MZ76 v2 extruder (MK3S/MK2.5S) with fan heat set inserts
prusaprinters
<p>I'm a big fan of MarcoZ76's FDM-printable redesign of the Bondtech upgrade for the Prusa MK3s. After taking apart my extruder for maintenance a few times, though, I noticed the screw holes for the extruder fan were getting loose. My fan wasn't fitting as snuggly and was beginning to rattle a bit. I know some people go to great lengths to avoid having to use heat-set inserts, but I think they're a pretty easy way to ensure things stay fastened well over time and through multiple rounds of reassembly. I updated each of the screw holes for the extruder fan, as well as all of the existing holes for Bondtech heat-set inserts, to accommodate <a href="https://amazon.com/gp/product/B07KP86T8G/">J&J Products M3 threaded inserts (5.7mm length)</a>. I haven't ever had issues with the Bondtech inserts, but these ones from J&J are thicker and I've had really good luck with them in other applications. The holes for the inserts have a 4.2mm diameter at the surface and an 8° taper to accommodate the tapered shape of the inserts and to help with inserting them straight.<br><br>I recommend using the right tool for the job when inserting these threaded inserts. A standard soldering-iron tip will work, but using an actual <a href="https://amazon.com/Heat-Set-Inserts-Compatible-SP40NKUS-Connecting/dp/B08B17VQLD">heat-set insert tip</a> will help with straight and flush installation.<br><br>I printed mine using ASA and PrusaSlicer's built-in Prusament ASA profile. For infill, layer height, and supports, please use the print settings MarcoZ76 recommends for his <a href="https://www.prusaprinters.org/prints/17584-bondtech-bmg-prusa-mk3smk25s-v2-fdm-printable-rhd-">original design</a> (30%, 2mm, with supports).<br><br>Big thanks to <a href="https://www.prusaprinters.org/social/408-marcoz76">MarcoZ76</a> for his extruder, and to Bondtech for sharing the <a href="https://github.com/BondtechAB/Bondtech_Prusa_i3">original design</a> under a GPL license. Aside from the heat-set inserts, I'm using genuine Bondtech parts and recommend people do the same.</p>
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