Back Panel of the P2S

Bambu Lab P2S Exhaust: The Official $20 Fix You’ve Been Waiting For

Written by: Rad Dad's Print Lab

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Time to read 3 min

Table of contents
Why the P2S Exhaust Upgrade Matters The Best Part: Free Rear Panel for Early Adopters What’s Included in the P2S Exhaust Kit Taking It Further: Extra Activated Carbon Filter Full P2S Exhaust Installation Steps Pro Tip I Learned the Hard Way Firmware Integration: How P2S Exhaust Works in the Menu Who Is This P2S Exhaust Upgrade For? Final Thoughts

If you’ve been wanting a better way to vent fumes from your Bambu Lab P2S, great news: Bambu Lab just solved the P2S exhaust problem—not with a brand-new printer, not with an expensive $300 accessory, but with a simple and affordable $20 exhaust kit.
In this guide, I’ll break down everything you need to know about the official P2S exhaust upgrade, including how to install it, how it works with firmware, and how to take your filtration even further with extra carbon filtering.

Why the P2S Exhaust Upgrade Matters

The Bambu Lab P2S already comes with a built-in HEPA and activated carbon filtration system, and it works pretty well for most users. But if you wanted to vent your printer directly outside through a window—you were basically on your own.
We’ve all seen creators like Thomas from Made with Layers literally cutting a hole in the back of his P2S to add external exhaust. It was a fun hack, but it also showed how badly many users wanted a factory-supported solution.
Now we have one.

The Best Part: Free Rear Panel for Early Adopters

Here’s what makes this P2S exhaust release even better:

  • Newer P2S models already come with the updated rear panel installed.
  • Early P2S owners can request the updated rear panel for free.

You can still install the exhaust kit on the original panel, but the updated version is optimized for better airflow and higher exhaust efficiency.
Before you order, just check your panel:

  • New panel: Has a sticker covering small grilles.
  • Original panel: No sticker or external exhaust port.

I love that Bambu Lab supported existing users instead of forcing everyone to buy a new machine.

What’s Included in the P2S Exhaust Kit

For around $20, the official upgrade kit includes:

  • External exhaust fan
  • Small control PCB board
  • 6-pin cable
  • All mounting screws and hardware

One thing to note: you have to print the housing yourself.
I printed mine in Bambu Lab PETG High Flow for heat resistance, splitting the print between my P2S and P1S to save time.

Taking It Further: Extra Activated Carbon Filter

To make this P2S exhaust setup even more effective, I added an extra activated carbon filter. Here’s why it matters:

  • HEPA filtration: Catches fine particles.
  • Activated carbon: Absorbs VOCs, smells, and chemical fumes from materials like ABS and Nylon.

Combined, they create serious air-quality improvement.
I used a carbon box design from Maker World (user: SPSN) and printed it in Polymaker HT PLA.

Find it at Makerworld

Full P2S Exhaust Installation Steps

Installation is straightforward, and Bambu Lab provides a full wiki guide and video. Here’s the simplified process:

  1. Remove supports from your printed housing.
  2. Install the small plastic clips (“claws”) on the lid.
  3. Add foam strips for sealing and vibration reduction.
  4. Plug the fan into the PCB (only fits one way).
  5. Install the fan label-side down to avoid reversing airflow.
  6. Secure the board with screws—don’t overtighten into plastic.
  7. Use the built-in cable management slot.
  8. Assemble the housing and add more foam for a tight seal.
  9. Insert your activated carbon box (if you’re adding one).
  10. Slide the whole assembly onto the back of your P2S.
Install the exhaust kit

Pro Tip I Learned the Hard Way

After I finished installation, the exhaust wasn’t showing up in the menu… and I panicked for 15 minutes.
Turned out I just forgot to plug the filament buffer back in. Once I reconnected it, everything worked perfectly.

Firmware Integration: How P2S Exhaust Works in the Menu

One of the best parts of this official kit is how smoothly it integrates with Bambu Lab’s firmware.
Once installed:

  1. Go to Controls > Air Conditioning
  2. You’ll see a new Exhaust option
  3. You can turn it on/off manually
  4. Adjust speed (100% is noticeable, but functional)

You also get a new print setting:
Purify air at print in

  • Internal circulation
  • Exhaust

The printer automatically manages the P2S exhaust based on your material and settings—no custom mods or third-party tools needed.

Who Is This P2S Exhaust Upgrade For?

This $20 kit is perfect for you if:

  • You want safer 3D printing in enclosed spaces
  • You plan to vent fumes outside through a window
  • You print ABS, ASA, Nylon, or other high-temp materials
  • You want a clean, factory-supported upgrade
  • You don’t want to cut holes in your printer

It’s one of the easiest and most practical quality-of-life upgrades you can do for your P2S.

Final Thoughts

Bambu Lab didn’t just add another accessory—they actually listened to users and solved a real pain point with the P2S exhaust system.
The kit is cheap, clean, fully supported in firmware, and early adopters even get a free rear panel.
If you have a Bambu Lab P2S, this is 100% worth doing.

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