PB Design - Sovol Zero - "ZeroTwins - TheLeft" // HEPA Carbon Filtration Recirculating

20260121 UPDATE_1:

The use of a klipper expander opens up new possibilities. Example: You can now also operate a 2-pin 6025 fan via the expander, so you don't need to use a special 4-pin fan if you choose this option.

Please see:

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"ZeroTwins" is my 2nd attempt on the topic of filtration for Sovol Zero. This project is splitted into two parts.

"ZeroTwins TheLeft" --> for chamber filtration.
"ZeroTwins TheRight" --> for exhaust filtration.

See also:

I already designed a functional filtration update for the Zero...

...but still wanted to optimize it in a few ways:

• HEPA, Carbon and Fan in the best possible order according airflow.

• Exhaust HEPA Filter inside the chamber.

• Making the carbon pellets for the exhaust replaceable.

• Keeping the BentoBox style HEPA filters, despite the very limited space within the chamber.

• A symmetrical and overall elegant and appealing design.

• Still sufficient HEPA Carbon air filtration.

All parts - except the main body for the chamber filter - can be printed on the Zero.

For the HEPA carbon box use height range modifier in slicer. 0-2,65mm - I used 25% honeycomb.

One of the three heat inserts has to be installed in the 6025 fan, to use it as mount for the fan grill.

All parts should easily self-align during installation. To hold the fan cable in place during installation, I used a small piece of gaffer tape.

Take a look at the photo gallery for instructions. The pictures should be self-explanatory.

Add Carbon, press in HEPA filter, slide in box, done! Everything fits perfectly in place.

Use any sort of higher temp material. I used ABS+ for the housing and ASA for box and grill.

BOM:

• 2x M3x6 for Sidepanel Mount

• 1x M3x35 (30-40) for Grill Mount

• 2x M3x40 (35-40) for Fan Mount

• 8x 6x3 Magnets

• 5x M3 Voron Style Heat Inserts

• 1x HEPA Filter (Bento-Box Style = "iLife V5 robot vacuum cleaner" Filter)

• 6025 Fan 24 Volts

• Carbon Pellets

Parts I used:

1) HEPA Filter:

https://de.aliexpress.com/item/4001333137700.html?pdp_npi=4%40dis%21EUR%21%E2%82%AC%206%2C27%21%E2%82%AC%206%2C27%21%21%2150.64%2150.64%21%40211b813f17656501277111213eef4e%2110000015723715590%21sh%21AT%21738244749%21X&spm=a2g0o.store_pc_allItems_or_groupList.new_all_items_2007550574343.4001333137700&gatewayAdapt=glo2deu

2) 6025 24V 4pin PWM Fan:

https://de.aliexpress.com/item/1005008213628357.html?pdp_npi=4%40dis%21EUR%21%E2%82%AC%205%2C40%21%E2%82%AC%205%2C24%21%21%216.14%215.96%21%40210384cc17679802931548118e4ef1%2112000044259540673%21sh%21AT%21738244749%21X&spm=a2g0o.store_pc_allItems_or_groupList.new_all_items_2007608036824.1005008213628357&gatewayAdapt=glo2deu

The Zeros board offers a 4pin PWM connector for 24V which can be configured in printer.cfg. See below.

Utilizing a klipper expander could also be a way to go.

Use spare 4 pin plug K_Fan3 on the original board! See also Sovol github for further information.

https://github.com/Sovol3d/SOVOL-ZERO

black - Ground
red - 24V
yellow - Tacho (rpm)
blue - PWM

3) Setup your printer.cfg:

The filter works perfectly for my needs. I use it at 50%, 75%, and 100% for maximum circulation.

If you like my design, feel free to like, comment or add a make :)

Happy printing!