MonoPrice Maker Select V2/ Wanhao Duplicator 3 cooling fan fix

thingiverse

The Monoprice Maker Select V2 is essentially a rebranded Wanhao Duplicator 3, but it's not a bad printer for the price considering current options. I purchased this printer a long time ago as my first one. Unfortunately, they have a poor print cooling fan design. It's just terrible. The heavy metal piece hangs down to almost touch the print, knocking off glass bed clips and thin print towers, and blocking your view of the print. This is a very bad design. They even have a YouTube video advising owners to grab the thing and forcibly bend the extruder mount upwards to "fix" the problem. It's still a terrible design. Here's what I did to fix it. The plate mounts the fan horizontally with the blower vent pointing just below the extruder nozzle. It clears small glass bed clips and is narrow enough for you to see how your print is doing. It's also lighter than the huge metal vent it replaces, which helps improve print quality by reducing weight on the extruder carriage. I designed this in SketchUp quickly, so it's not the prettiest picture, but it works fine. This needed no support when printed on my ANET A8. I highly recommend printing with PETG instead of PLA because PETG is as easy to work with and retains ABS heat tolerance. Don't use PLA because the nozzle's proximity to the hot end causes it to sag eventually. Assembly is straightforward. The fan is held in place by two small screws from the top, the vent stem by two small screws from the bottom, and two M3 or similar bolts secure it to the extruder carriage. Most people will have the necessary materials lying around. I used Hatchbox PETG and printed this on my ANET A8 at 0.25 layer height, 15% infill, and 100% cooling after the 10th layer. The bed temperature was 70°C and the extruder temperature was 240°C.