Prusa i3 MK3 MeanWell NES-350-24 PSU Case/Mount

thingiverse

I had a spare Meanwell NES-350-24 power supply sitting for over a year as a backup in case my stock MK3 power supply failed. Well, it finally died on me and I wasn't too thrilled with the online cases available, so I decided to design my own. It takes many design cues from the original Prusa power supply case but is optimized and sized for the larger Meanwell power supply. I printed this in Prusament Jet Black PETG and have tested it on my personal MK3, and the fit and tolerances are perfect. If you're printing with a different filament type than PETG, I can't guarantee the fit will be the same. The frame is still very sturdy like the stock PSU, and as an integral part, it helps keep the frame rigid. I reused the stock screws that hold the PSU to the frame and to the Y-axis. An adapter plate is needed to secure the PSU to the frame since the mounting holes between the stock PSU and the Meanwell PSU are different. You will need longer wires for the two power cables that run from the Meanwell PSU to the Einsy board; the power panic wire is longer and doesn't need to be extended. The original power switch and power receptacle/power panic board will be reused, but you may need longer wires from the power switch and power receptacle. I just remade new ones when I put together the Meanwell power supply. The bottom cover has a small notch in the corner closest to the Y-axis bracket because the Meanwell power supply is bigger and would interfere with the back plate of the extrusions on the Y-axis. Screws needed for the case: - 2 -- M4 x 8mm Flat Head Hex Drive Screw (Adapter Plate to PSU) - 4 -- M4 x 10mm Flat Head Hex Drive Screw (Top Cover to PSU) - 2 -- M4 Nut (Prusa Frame to Adapter Plate) - 4 -- M3 Square Nuts (Bottom Plate) - Can be reused from your stock PSU case - 6 -- M3 x 8mm Flat Head Hex Drive Screw (Top plate to bottom plate & power receptacle) - Can be reused from your stock PSU case - 6 -- M3 Nylon Lock Nut (Power receptacle) - Can be reused from your stock PSU case