Anycubic I3 Mega - PSU Cover NOCTUA 60x25

Starting

This is part 1 of my airflow concept for the Anycubic I3M case.

Part 2: Anycubic I3M - Mainboard Fan NOCTUA 92x14
https://www.thingiverse.com/thing:3441556

Part 3: Anycubic I3M - Double MOSFET 3D-Freunde with NOCTUA 40x10
https://www.thingiverse.com/thing:3441580

I started to change the fans in the Anycubic I3M ... there are many proposals in Thingiverse for PSU covers, holder for mainboard fans and different fan types. So I select the most interesting ones and started printing. After opening the Anycubic case to install, I noticed, that the PSU printout doesn't fit and that the mainboard fan covers the connections of the mainboard. In addition, I also wanted to extend the printer to the MOSFET 3D-Freunde...

So I developed and implemented the following new approach ...

Aims

The three components (PSU fan, mainboard fan and MOSFET) should work together so that the housing of the Anycubic is ventilated in the best possible way.

Solution

The central mainboard fan sucks the fresh air from the outside and distributes it in the housing. Two slow-speed 40mm fans continue to conduct the airflow, additionally cooling the MOSFET. The air flow from the psu fan is then transported outwards via two grille openings in the PSU (chimney effect).
See airflow picture.

Implementation

First, I compared and analyzed the performance of the fans in question. Many people are using the Scythe SY1012SL12L (100x100x12) fan for there PSU and mainboard projects. It is / was cheap (not available right now ?) and seems to do a good job - but there are better solutions.

Fan	mm	RPM	m3/h	dBA	V	A	MBFT	€
Scythe SY1012SL12L	100x100x12	1000	15.2	14.5	12	0.09	30000	~ 6
Noctua NF-A9x14PWM	92x92x14	2200	50.5	19.9	12	0.11	> 150000	~ 18
+ Low Noise Adapt NA-RC7		1700	38.1	13.5			6 years warranty
Noctua NF-A6x25FLX	60x60x25	3000	29.2	19.3	12	0.11	> 150000	~ 18
+ Low Noise Adapt NA-RC10		1700	23.5	14.5			6 years warranty
+ Low Noise Adapt NA-RC12		1600	16.7	8.2

• The Noctua NF-A9x14PWM (using the LNA-adapter NA-RC7 from the kit) delivers twice the air volume at the same loudness as the Scythe - the MBFT is three times as high.

• The Noctua NF-A6x25FLX (using the LNA-adapter NA-RC10 from the kit) delivers one third more air volume at the same loudness as the Scythe - the MBFT is three times as high.

So, I used the (expensive) Noctua kits because of the higher air volume and the better MBFT.

Installation

Have a look at the pictures - my PSU version had VERY little room for a replacement fan (upright coil and condensators) - I've printed SO MANY test covers until then all fit!! I used a Noctua NF-A6x25FLX with the Low Noise Adapt NA-RC10. Perhaps the new housing should be a little enlarged for the fan cable feed.

The test prints were made with PLA - the final print with ABS filament.

A little advice ... check your PSU before start printing ... I know what I'm talking about ... ;-)

The 'Anycubic I3M - Vibration Damper Feet' allow additional air intake:
https://www.thingiverse.com/thing:3440488