Active cooling for Flsun V400 (120mm fan)

Can be used without fan with only the sides (passive flow).

I needed a better way to cool the printer in a non-air conditioned room since the passive risers I previously used (available at Passive vents) were not very effective in getting fresh air into the enclosed space.

To address this, I created a design that incorporates a fan I already had, which is a standard PC fan from Noctua. Although not perfect, it works great and operates silently.

The fan is mounted on one of the printer sides (not enough space above the front circuit board), and pulls air out of the enclosed space (and in through the front and above the small fan cooling the circuit board).

All sides of the modification are designed to be printed upside down without the need for any supports. It is recommended to print the vent grilles with the front face down and without supports.

In addition to the provided vent designs, it is easy to create other designs since there are appropriate slots to accommodate them. Each side also features a mounting slot to ensure stability during installation.

The end results for my printer are low temperature for the MCU, and much improved cooling for the stepper drivers (the original fan can now work with cooler air). The stepper motors are also way cooler than before. 

Printing:

All parts fits within the V400 print bed. 

Print the sides upside down

Print the grilles with the front face down.

The parts have not been turned, and are provided in the mountable direction.

Two sides and one side with fan is needed (depending on which side the cables should exit, the with or without cable outlet should be selected).

Mounting

M3 screws with a minimum length of 25mm are needed.

Fan power

To mount a buck converter / 24v to 12v step down converter, the following PCB connector can be used:

Example 

Printed using black PLA.