CPU Case for Alfawise u20 to fit BIGTREETECH SKR 1.3

thingiverse

Update 1/12/2020: Tightened lid fit to prevent trimming, which was necessary due to its initial snugness. A BIGTREETECH SKR 1.3 board upgrade called for a custom case to replace the stock Alfawise u20 enclosure. While an insert adapter could have been designed, bulkiness was unacceptable. A new case was crafted to accommodate the board while retaining the original wire connectors and incorporating a fan to cool the 2208 drivers. The power supply was separated and installed vertically behind the right pillar, with longer main power wires used to bridge the distance and secured by zip ties along the printer's rails. Brass nut inserts were added inside the case for secure connections between the board and lid. The lid design focused the fan on stepper motor controllers before circulating air out of the box through a side vent. A deliberate design choice omitted a full grill extrusion on one side to eliminate an annoying whistling sound that occurred when it was fully extended. Two distinct versions of the box were created: one without rail inserts and another specifically designed for the Alfawise u20. The latter version features a rail insert, allowing the box to sit securely on the outside left rail, slide into place, and lock in position. Materials used include: * M3x5mm Embedment Brass Nuts (8) * M3x5mm bolts (8) * 12-gauge wire for new power wiring with 2 spade terminals connecting to the power supply