Air Purifier for 120mm fan - Free 3D Print Model

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Print Profile(1)

All

P1S

X1 Carbon

H2D Pro

H2S

X1E

H2D

A1 mini

P1P

P2S

H2C

X2D

A2L

0.2mm layer, 3 walls, 5% infill

Designer

5.9 h

2 plates

5.0(3)

Open in Bambu Studio

Boost

205

Released

Description

I originally designed this air purifier for laser engraving indoors during winter, when opening a window to vent fumes wasn’t an option.

This 3D-printed housing turns a standard 120 mm AC Infinity fan and 120 mm HEPA filter into a compact, efficient filtration system. It’s ideal for small enclosures, desktops, or workspaces where you need cleaner air — especially around 3D printers, laser engravers, or resin stations.

The enclosure features a tight-fitting snap-lock lid that securely holds the HEPA filter in place. The snug seal is intentional to minimize air leaks and ensure that all airflow passes directly through the filter. The fan mounts inside the housing using standard screws, and a side power port makes it easy to connect power.

A duct adapter on top connects to 3 mm vent hose, allowing you to route filtered air or fumes out of an enclosure as needed.

I have included the Fusion 360 file in case you want to modify it to fit your own fan!

Features

Compatible with 120 mm AC Infinity fan and 120 mm HEPA filter
Snap-fit locking lid minimizes air escape for maximum efficiency
Side power port for quick access and clean cable routing
3 mm vent hose adapter for exhaust or airflow redirection
Screw-mounted fan installation for durability and easy service

Printing Notes

Supports are already included in the 3MF file.
To remove supports, use needle-nose pliers: gently squeeze the sides together and pull — they release easily.

Assembly

Mount the 120 mm fan into the base with M4 × 20 mm screws.
Insert the HEPA filter into the top recess.
Snap the lid firmly into place — it will be tight by design.
Connect the power cable through the side opening.
Attach the 3 mm vent hose to the outlet adapter.

Parts Used

Fan: AC Infinity 120 mm Fan on Amazon
HEPA Filter: Replacement Filter Pack on Amazon
Ducting: 3 mm Vent Hose on Amazon

Comment & Rating (12)

@Liks

I printed it on A1 mini using PLA. It came out very good. The only trouble was removing the support. It doesn't come off easily. Very difficult to remove.

The designer has replied

@mikehack

hi! Did you use the settings it came with? Mine popped right off. Have you calibrated your filament? You might need to adjust the support interface level depending on your filament if it is too hard to remove it.

@Liks

Replying to @mikehack :

Yes I used the settings that came with it. I took a shortcut my filament is not calibrated yet. It could be that I should have adjusted the support, I just took over the settings. Only changed the Nozzle. And I am surprised that even though I use a 0.6mm Nozzle, the print came out at 0.2mm height. Although the Nozzle settings were for 0.6mm nozzle. I usually print with PETG Basic.. I didn't want to used it because the print time would have been almost 8 Hours only for the first part. I then opted for PLA because the BambuLab Studio slicer showed that this will take only about 3:30 Hours to print. I did want to wait that long, I wanted to try this thing, that's why I took a shortcut, because PETG Basic is calibrated but PLA is not yet calibrated. I just bought it the other day.

@mikehack

Replying to @Liks :

My print profile is for a .4mm nozzle, I recommend adjusting your settings for using a different nozzle size.

@Spiker1990

Print Profile

0.2mm layer, 3 walls, 5% infill

printed perfectly. design is a little off as most cables for 12cm fans run closer to the corner, so forcing the cord through the slot and keeping the fit was a challenge.

The profile uploader has replied

@mikehack

If you send me a picture of where the cable is on yours I can make another profile with a different cable opening

@Billybob92

Print Profile

0.2mm layer, 3 walls, 5% infill

Perfect print :)

@jerebediah

Is it possible to get a 4" hose adapter to the box?

@Printbro78341

That would be nice.

@Agostic

No room for charcoal filter

The designer has replied

Show original

@mikehack

The HEPA filters I use have actived carbon built into one half

@PyroTurtle

Print Profile

0.2mm layer, 3 walls, 5% infill

No more

License

This user content is licensed under a Standard Digital File License.

You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.