120mm Fan to HEPPA Filter 86880

** THIS IS A VERY ROUGH WORK IN PROGRESS**
I am not an expert in 3D Design by any means, this looks rough, but it works. If you have the skill and would like to remix this so it looks better/preforms better, please do!

See new and improved version here.

This is a 120mm fan to HEPPA 86880 filter adapter for 3D Printer & Laser Engraver enclosures. I originally mixed this design for the SparkMaker LaserPro 10W Enclosure that uses a 120mm fan.

This is a low cost alternative to running a vent or using a commercial air scrubber.
You will need a fan with a decent CFM, I'd suggest nothing lower than 200CFM.

I will update this project as I refine the design and parts more.

PARTS USED:
1x Tupavco TP1509 120mm 200CFM 12VDC/3.4A Fan (4 Wire)
3x Pigtail MOLEX connectors (2 male, 1 female)
1x 12V DC 4A AC/DC Adapter
Any generic 86880 HEPPA filter, I like this multipack.
OPTIONAL
12V DC Motor Speed Controller 1203BB

Assembly
Mount the fan to the printed part and your enclosure... this will vary greatly based on your enclosure. Insert the HEPPA filter and activated carbon pre-filter (optional) into the cavity and snap on the corresponding cover- pay close attention to the proper air flow and watch for gaps. The filter will be asnug fit. Mount the optional DC motor controller in the box with M2/M3 screws (depending on your board and tolerances), and complete the steps below. Install the lid, then mount the box at a place of your choosing with 2-sided VHB tape.

Electronics Assembly & Wiring

• Important information if you are using the above DC Motor Controller and a brushless fan: Brushless fans (which most “PC Case” fans are), can NOT be reversed, and the polarity matters. Pay close attention to ensuring you are not crossing the Pos+ and GND-. For this exact setup with the parts above, the DC motor controller has a “reverser” switch that swaps the polarity of the motor output. Do not use this- this particular fan seems unharmed by swapping the polarity, but it doesn’t run in reverse. You can opt to just not use the switch and seal it into the box, but it does need to be connected to the board. The speed knob “clicks” on and off in its place. *For LaserPro users: Do NOT connect this fan directly to the fan port on the LaserPro control board. This is a 12V 3.5 Amp fan. I was unable to locate the max amperage the board can handle, but I highly doubt it is 3.5A for just one fan. If you want to have the exhaust turn on and off with the LaserPro, use a 12V power relay on the extra fan port with a small 2-pin cooling fan, or the "Active Exhaust" fan, then wire the N.O. contacts between the GND- from the DC power supply and the GND- on the speed controller input.

• This is low voltage, but you should always take the proper precautions. Never work on energized equipment. Always check your polarity, and make sure you familiarize yourself with the correct connections on the hardware itself- don't rely on photos from the internet or Amazon.

  1. Connect a male JST/MOLEX pigtail to the motor outputs on the 1203BB (Polarity matters for brushless motors!) . Ideally, black to GND-, red to Pos+. Check for a pinout online for a 3 or 4 pin PWM fan- don’t rely on the wire colours. (This link is considered the standard pinout for all PWM 3 or 4 pin fans. Typically Red/Yellow(+) and Black(GND-).
  2. Connect another male JST/MOLEX pigtail to the 12VDC input. (ENSURE POLARITY IS CORRECT!) (Optional, you can also just direct wire this- I bought a massive multipack of these so making it easy)
  3. Connect a female JST connector to the wire-out ports on the 12VDC 4A Adaptermake sure the wire colors match up to the male JST you just wired to the 12VDC input on the 1203BB. Remember... Direct Current is polarized, and most control boards are not forgiving of crossing the + and GND(-).

  4. On your 120mm fan of choice, locate the 12VDC + and GND (Should be pins 1 & 2 (Black/Red)

     • 4A. Splice these off and connect these to a female JST pigtail using heat shrink tubes.
     • 4B. Connect the female JST from the fan to the male JST from the motor output.

  5. Connect the male JST from the 1203BB 12VDC input to the female JST from the 12VDC 4A adapter.

  6. Using 4x M3 screws + bolts, secure the 1203BB board to the electronics case. You will need to remove the knob for the speed control first.

     Print Settings

Printer Brand:

Prusa

Printer:

i3 MK3 MMU 2

Rafts:

No

Supports:

Yes

Resolution:

.25

Infill:

15

Filament: eSun PLA+ Yellow
Notes:

3 Perimeters recommended

How I Designed This

Shoutout to the below creators that I remixed components from:

PSomone: HEPPA Filter enclosure with lid
TheMeerKat: 120mm fan mount
dfrechette: 1203BB Controller Box