prusa i3 mk3 PSU adapter for MeanWell 350

thingiverse

Note: FourOhFour has remixed the main base (smaller, cut-out for the vent slots). Seems like a solid improvement. I have not printed it, so YMMV. https://www.thingiverse.com/thing:2814343 --------- Fixed version up. Changes: - brace_v2.stl 1) pulled the angled brace back so it doesn't interfere with the bed. Mounted it and verified the fit. 2) made the mounting holes to the vertical frame into slots. This should allow flexibility on the fit such that the brace supplies stiffness but does not torque the frame. - brace_base_v2.scad updated to generate brace_v2. Other components unchanges. Note: because I haven't built a new wiring harness yet, I am using the PSU holder and the brace independently I have previously verified the PSU holder mounts to the base, but have not tried it with the latest print. ------- This is a quick adapter for a MeanWell 350W PSU to fit the Prusa i3 mk3. Four parts: - the main brace - the PSU holder - bottom plate for the PSU holder - small spacer disk to place between the top of the PSU and the brace This is designed to fit the original plug/fuse/power-panic assembly and the original power switch. Be aware that because the PSU is mounted a bit higher and a bit to the right, the original PSU wiring harness will not reach the Einsy. You'll need to build your own harness (I'm using 14 gauge wire with crimp connecters, and leaving the power-panic unconnected for now since I'm on a UPS) I printed it in PETG with 30% infill and got quite a solid piece. Generally no support is needed. All four parts can be tweaked and reproduced from the SCAD file. Set one of the four parameters at the top to "true", the others to "false": create_base = false; create_brace = false; create_bottom_plate = true; create_spacer = false; ============ Copied from a comment: Mean Well NES-350-24 24V 350 Watt UL Switching Power Supply 120 Volt https://www.amazon.com/Mean-NES-350-24-Switching-Power-Supply/dp/B00KTJE3L4/ref=sr_1_1?s=electronics&ie=UTF8&qid=1518387356&sr=1-1&keywords=Mean+Well+NES-350-24+24V+350+Watt+UL+Switching+Power+Supply+120+Volt http://www.meanwell.com/productPdf.aspx?i=457 Why I'm not using the stock: My original PSU died after a month (blew the fuse, wouldn't work with replacement fuse, middle of a long print). Replacement (support discussions plus shipping from Europe to US) took a week and I wanted to keep printing, so I bought the MeanWell PSU. My replacement PSU never worked (would randomly drop to zero volts when the heated bed kicked in), so I went back to my MeanWell. I'm trying my third prusa PSU right now (printing the latest version of this holder), but I plan to use the MeanWell and keep the prusa as a backup. The upside of the MeanWell: - I have more confidence it won't die during a print - No annoying clicking when the bed is at temperature like the Prusa PSA - No really annoying rattling of the heat-shield (or having to stick a zip-tie in to stop it) Downside of the MeanWell: - Fan runs periodically - doesn't fit original case. In the end, I'll probably mount the MeanWell PSU under my bench and run 24V and a switch up to the Prusa. When I have the case/brace printed for that, I'll post it.