Adjustable Spool Support

prusaprinters

<p>I started this project from tdanro's "Adjustable spool holder for the Original Prusa i3 MK2"<br/> (<a href="https://www.thingiverse.com/thing:2122419">https://www.thingiverse.com/thing:2122419</a>), but it evolved into a shelf mounted unit, and<br/> the capacity was enlarged somewhat.</p> <p>This is admittedly total overkill, but I had some of the hardware already &amp; just wanted<br/> to learn more about putting together a more complex project in CAD.</p> <p>It's designed to print with default settings and without supports (at least it prints fine<br/> without them on my Prusa MK3, but YMMV).</p> <p>The printed parts/quantities:</p> <p>(1) Center.stl<br/> (1) Center_top.stl<br/> (1) Pinion_bottom.stl<br/> (1) Pinion_top.stl<br/> (1) Knob.stl<br/> (2) Slide.stl<br/> (2) Rack.stl<br/> (4) Roller.stl<br/> (4) Standoff.stl</p> <p>Hardware:</p> <p>(2) 8mm x 200mm shafts <a href="https://www.mcmaster.com/6112k44">https://www.mcmaster.com/6112k44</a><br/> (4) M8 x 1.25mm socket head bolts <a href="https://www.mcmaster.com/90128a276">https://www.mcmaster.com/90128a276</a><br/> (4) M8 x 1.25mm nylock nuts <a href="https://www.mcmaster.com/94205a260">https://www.mcmaster.com/94205a260</a><br/> (4) 8mm LM8UU linear bearings <a href="https://www.mcmaster.com/61205k75">https://www.mcmaster.com/61205k75</a><br/> (4) 608/skateboard Bearings <a href="https://www.mcmaster.com/5972k91">https://www.mcmaster.com/5972k91</a><br/> (4) 4-40 socket head screws* <a href="https://www.mcmaster.com/91251a149">https://www.mcmaster.com/91251a149</a></p> <ul> <li><p>The socket head screws I used were 1.5" long to mount on a half inch thick shelf.<br/> any similar sized machine or wood screw would work, though you might want<br/> to change the mounting holes to accomodate.<br/> Assembly:</p> <p>Pretty obvious I think, except for the pinion gear. I split that in two to make the<br/> print simpler. It aligns and joins with two pieces of scrap 1.75mm filament.<br/> (BTW - the best glue I've found so far for PLA is DAP Rapid Fuse). Once glue is set<br/> use an x-acto to clean up any excess glue and debur.</p> <p>The LM8UU bearings seem to vary in size somewhat. I've sized this for typical metal<br/> cased bearings, but also had some drylin bearings that were fairly loose.</p> <p>Note that the standoffs go between the bearing and the slide so that the bolt can be tightened while still ensuring that the bearing turns freely.</p> </li> </ul> <h3>Print instructions</h3><p>Category: 3D Printer Accessories</p>