FlashForge 5M Pro Chamber / Bed Fan Duct

I made this to try to deal with the tendancy of the right side of prints not looking as robust as the left side when printing overhangs.  Specifically, my 3DBenchy's have a tendency to warp/melt a little on the bow overhang but ONLY when oriented with the bow to the right.  I decided to install a second chamber / bed fan on the right side and wired it in parallel with the existing LEFT side chamber fan (just tie into the RED/BLACK/BLUE and leave the YELLOW tach wire off for this second one and trust that the left fan tach will be sufficient/match).

This is best used with a GDSTime Brushless DC Fan Model GDB1232 which has 4-wire control and a 57x28mm opening for the duct and fits between the home position sensor and the z-axis screws.  It is sort of a PITA to remove the right side shroud on the Pro, but once you do, you can drill holes to mount the fan in and then just pop the pins out of the left fan and solder the RED/BLACK/BLUE wires from the new fan on to those and wrap up the yellow tach wire (you won't need it and we'll just use the feedback from the left for the speed).

It is meant to be printed laying on the right side and should print with no supports.  I would use ABS/ASA and 0.2mm layer height.  There isn't much infill to print, so just use like 3 or 4 walls and top/bottom layers.  I did a lot of modeling of air flow with the 3D model to get some laminar flow and added vanes inside to help direct a bit and followed HVAC cross sectional reduction area over length to be as efficient as possible.  This ends up actually having more/better flow than the original vent on the left, so when running at the same speed, it is blowing more air, which is unfortunate.  I just printed another one MIRRORED and put another fan which allowed it to match much better…