PSU replacing Frame brace for Original Prusa i3 MK2/S

thingiverse

<h2><strong>UPDATE 06-07/05/2019: Reduced the height of the screw holes by -2.5mm, added Version for MK2, and included a text file.</strong></h2> <p><strong>Explanation:</strong></p> I received messages that the frame brace doesn't fit on some printers, and they were right! I edited the part using this CAD Model from the Prusa MK2 (<a href="https://grabcad.com/library/prusa-i3-mk2-2">https://grabcad.com/library/prusa-i3-mk2-2</a>). However, many parts were updated for the MK2S as well as the PSU_Y-Part. This is the bottom attachment point of the frame brace.</p> <p>I mounted the brace with M3 bolts to the frame instead of M4 screws because I didn't have any M4 nuts. As a result, the brace fitted quite well on my printer, and I didn't notice that it was slightly bent... One thing on the MK2 is that the crucial height of the part is 15mm. The updated version for the MK2S has a height of 17.5mm, so the screw holes for the frame are misaligned by about 2.5mm.</p> <p><strong>Important Info:</strong></p> I corrected the error; the new holes are "drilled" 2.5mm lower on the updated frame brace. I also changed the name of the parts as follows:</p> <ul> <li>i3mk2_S_fb = use for MK2-S Printer, like the original Version from Mikola for the MK3 but with changed holes</li> <li>i3mk2_S_fb_cutout = use for MK2-S Printer, part has a cutout</li> <li>i3mk2_fb (needs to be tested) = use for MK2 Printer</li> <li>i3mk2_fb_cutout (needs to be tested) = use for MK2 Printer, part has a cutout</li> </ul> <p><strong>NOTE:</strong></p> If you have updated your MK2 to an S, the PSU_Y_Part should still be the old one. For comparison, check the pictures or measure the height (15mm MK2 / 17.5mm MK2S). I am waiting for approval from two volunteers before the part will no longer be "Work in Progress." Additionally, I would like to find someone who wants to test the "old design" = i3mk2_fb on the MK2 to ensure it really fits!</p> <p><strong>ATTACHMENT:</strong></p> You need the original PSU Screws and two M4 Nuts to attach the mount to the printer.</p> <p><strong>General Info:</strong></p> Remixed this part from <a href="https://www.thingiverse.com/thing:2859884">mikolaszuza PSU Frame brace</a>. The release of the video and the brace came at the perfect time for me, as I was thinking about some details on my own LACK enclosure setup. Check out this video (<a href="https://www.youtube.com/watch?v=oS7ZtBNh2hE">https://www.youtube.com/watch?v=oS7ZtBNh2hE</a>), and also see the original thing from Mikola (<a href="https://www.thingiverse.com/thing:2859884">https://www.thingiverse.com/thing:2859884</a>). There are two versions: 1:1 design only with replaced mounting points, and another one with a cut-out in the midsection for better looking and more vertical shells to get a little bit stiffer, also saving some filament.</p> <p>I am not totally satisfied with the mount because on the MK2S, the lower PSU mounting point is much smaller than the aluminum extrusion bar on the MK3 frame. However, without a spool holder on top of the printer, it should be fine. When you push against the frame, the lower horizontal part of the bracket bends a little bit.</p> <p>PS: Nice video I found about "infill & shells setup and strength comparison" <a href="https://www.youtube.com/watch?v=AmEaNAwFSfI">https://www.youtube.com/watch?v=AmEaNAwFSfI</a></p>