40mm to 25mm fan adapter for ROBO 3D

thingiverse

This adapter is for the Robo3D R1 Plus 3D printer and serves as a replacement for the stock 25mm extruder fan with an incredibly quiet model. I had previously tested several other 25mm fans but found that they were often poorly constructed, prompting me to design this custom adapter which will accommodate a 40mm fan instead. Mounting the adapter is done by using the original screw holes; you'll also need some 15mm flat-head screws and a cap for securing the bottom two holes where the larger 40mm fan sits. The top two holes require about 12mm wood screws. Be sure to replace the existing X-MIN setting's screw as it needs to be lengthened by 10mm due to increased thickness of the adapter's head on one side.