Firmware-compatible air filtration system for enXLosure

I wanted to incorporate the original Prusa enclosure electronics into my $129 enclosure design. This way, you will have the best of both worlds!

The first step is integrating the original alveo3d filtration system into the enXLosure. It uses the Prusa blower fan and filter unit, which connects to the mainboard directly.

Therefore you can set up the filtration performance and even post-print filtration duration (e.g. when you print from materials such as ASA or PCCF) so that the system runs for additional time to filter out all particles produced during the print job. you can also check the lifespan of the HEPA filter easily in the printer’s menu.

I designed the system to print fully without support and to cover the fan and filter system fully. Also, I designed it so you can replace the filter from the inside, so you do not need to move the heavy printer.

Needed for this build;

- Prusa high-pressure blower fan
- Alveo3D HEPA carbon filter
- 3D printed parts
- 7x M4x12 bolt
- 7x M4 nut
- "Backpanel_modifier" or “EnXLosure_Backpanel_Btm_Filter”

Important note;

A complete parts kit, including HEPA and pressure blower fan with pre-crimped wires, is available via Blurolls online store via; 
Blurolls Air HEPA Filter for Enclosure Prusa MK4 MK3S XL ($35 excl. printed parts)

Note; these parts are not original Prusa, but they function the same and have the same specifications and compatibility.

Printing instructions;

The parts are both pre-oriented. The mainbody needs little support in the slot in which the fancover slides. This is placed easiest with smart fill in Prusaslicer and easily removable.

Print with PETG. 3 walls and 25% Gyroid or Cubic infill.

Modifying the Bottom back panel;

The module mounts to the Backpanel_Btm part. Therefore, you must either modify your existing one or buy a new laser-cut version locally. (Drilling aid as well as DXF provided)> Modifying is easiest with either a dremel-tool or a jigsaw with a fine-tooth blade. Alternatively, you can use a small iron saw.

Assembly;

1) 

Push through sacrificial layers and place all M4 nuts in the dedicated pockets

2) 

Route the fan cable through the hole and carefully lower the fan into the housing. Secure with 3x M4x12 bolts Note; watch the wire, it must not get pinched

3)

Slide in the fancover, make sure the orientation is correct and the hole aligns well with the fan

4)

Place the HEPA filter inside of the pocket. The carbon side should be on the back and it should fit snug.
 

5)

Mount the assembly to the back of the modified Backpanel

6)

Open up the electronics box and remove the antenna cover. Feed the cable through the hole, in between the DWARF1 and DWARF2 cables. *

  Connect it to the Fan1 connector on the XL sandwich board.

7) 

Close up the electronics watching to not pinch any wires in the process

8)

Enable the enclosure settings in the firmware under Control → Enclosure *

Note;
If you want to adapt your current backpanel, you can either print the drillingaid, or reference to the dimensions here;
 

*= image courtesy of Prusa3D