VentoBox Air Filter System for Bambu P2S

IMPORTANT

• Please read the PRINTING ASSEMBLY & INSTALLATION (watch the videos too) Guide below before starting the project. 
• I recommend using PETG for this project. PLA is not advisable, as the exhausted warm air can cause the VentoBox to soften.
• You can order the pre-assembled ventoBox, Hardware Fan Kit, HEPA filter and activated carbon filter from Voxelpla (US), VTC3D (EU) & Tikihaus (SEA). Please check out the vendors' listing below.
• I do my best to double-check and test the print profile I create. They are up to date with whatever changes I made to the designs. If you are using profiles created by others, please verify that they are up to date.

UPDATE 13 Apr 2026

With the new firmware update, you will notice an increase in max fan power. Previously, G-code at 100% did not equal full hardware output. With firmware and touchscreen control, the fan now runs closer to its true maximum. This gives more headroom, so even with a fully packed carbon box, 80–90% is sufficient.

UPDATE 10 Apr 2026

As with any firmware update, there may be some teething issues. Currently, 2 known bugs:

1. ventoBox does  not turn off after calibration completes
2. Some versions of Handy do not turn on ventoBox during printing. 

These issues are being looked at, and there will be an update in a few days.  If you notice other issues related to VentoBox with this update, please let me know. Sorry for the inconvenience caused and thank you very much for your patience. 

UPDATE 09 Apr 2026

The new firmware for the P2S (ver 1.02.00.00) has been released, and it introduces native touchscreen control for the VentoBox air filter. This is a collaborative initiative between Bambu Lab and myself. VentoBox now works without the need for custom print profiles, and activates automatically even when printing via the Handy app. There is also an update to the stock P2S print profiles in Bambu Studio. Below is a quick overview of how it works.

 

ventoBox Control Behaviour When ventoBox is enabled (checkbox ON) - You can set the fan speed between 50% and 100%. - If the exhaust sound is too loud, you can set the speed to 80-90% - This can only be done when the printer is paused or NOT printing.   During printing - Fan speed cannot be changed while printing. - If you try, the printer will show an error message.   When ventoBox is disabled (checkbox OFF, but still plugged in) - If VentoBox is still connected to the left aux fan port, the printer will treat it as if you have installed a left aux fan. - The fan in the ventoBox will still run, and its speed will mirror the right aux fan automatically.   If you want ventoBox to be effectively off - Before starting a print, set the fan speed to 50%. - At this setting, airflow is negligible and does not affect chamber conditions.

REGIONAL VENDORS

INTRODUCTION

Since the launch of Bambu Lab P2S in October 2025, a common question has emerged regarding the original BentoBox's compatibility with the new printer, with many users asking if a modified version would be made available for the P2S.

The original BentoBox was launched in September 2022 for the X1C and P1S. With the significant advancements found in Bambu Lab's second-generation printers, I felt it was time to level up my own design as well. Instead of simply tweaking the existing BentoBox, I decided to take a completely fresh approach and redesign a new air filter from the ground up.

Meet ventoBox - powerful and multifunctional

DESIGN APPROACH

The ventoBox is built around a powerful 7530 blower fan, capable of generating up to 20 mm H₂O of static pressure. This high pressure is key, as it pulls air effectively through the HEPA and activated carbon filters, ensuring thorough filtration without sacrificing airflow.

To handle different printing materials, ventoBox features 2 distinct operational modes.

In Single-Pass Mode, designed for materials like PLA and PETG, the ventoBox acts as an exhaust system. It pulls air from the chamber, pushes it through the filtration stack, and expels the warm, clean air outside the printer. This is ideal for improving chamber temperature during cool printing.

Switch to Multi-Pass Mode for high-temperature materials like ABS, ASA, or Nylon. Instead of exhausting the air, this mode recirculates it, pulling warm air from near the build plate and redirecting it to the bottom to create a consistent temperature throughout the build volume. This circulation is crucial for stabilising the hot environment these advanced materials require.

Single-Pass Mode	Multi-Pass Mode

The ventoBox was designed with simplicity in mind, making it both easy to print and intuitive to assemble. The entire system requires just 255 grams of filament and can be printed in under 7 hours on a Bambu Lab P2S. PETG is suitable for printing ventoBox, as it comfortably withstands the chamber temperatures of up to 50°C encountered during a hot chamber environment. 

The ventoBox can operate as a standalone unit powered directly by an external power brick with a 2-pin fan configuration. This 2-pin 7530 fan can be easily sourced online, giving users the flexibility to use either a 12V or 24V fan (a 5V fan is not recommended).

Alternatively, ventoBox can be configured with a 4-pin fan connected to the P2S secondary fan port. With the updated firmware, ventoBox can be enabled directly from the P2S touchscreen, providing a more integrated user experience. 4-pin 7530 fans are now available through regional vendors, making this setup more accessible to the community.

BILL OF MATERIALS

Hardware: D6x3mm magnets - 8pcs M3x8mm BHCS - 3pcs BT3x8mm self threading screw - 1pcs VHB tape (1mm thick)  machine oil (optional) 7530 blower fan - 1pcs  Consumables: Activated carbon pellets (acid-free) HEPA filter ( iLife v5 vaccum) Tools: M3 Allen key Hot glue gun
7530 FAN SPECS (2-Pin Configuration) This section outlines the recommended specifications for a 2-pin fan setup when using ventoBox in standalone mode on the P2S. Basic Specs Speed – above 3500 rpm Air Pressure – above 15 mmH₂O Air Flow – around 14 CFM Noise – under 50 dBA 2-Pin Configuration (Standalone, Manual Control) Connector – 2-pin JST XH 2.54 mm Cable Length – at least 25–30 cm Voltage – 12V or 24V, depending on the power brick used Depending on the power brick placement, wire extension may be required

PRINTING GUIDE

I have prepared all the setting for support, infill and grills in the 3mf file.  With 2 colors, total print time is 6h30m.

VENTOBOX ASSEMBLY GUIDE (2-Pin Fan Configuration)

Apply a light coat of machine oil to both vertical edges of the shutter door.	Install the shutter with its smooth side facing forward. This orientation is critical for proper operation.	Insert the shutter into the fflue at an angle.
Slide the bottom of the shutter onto the mounting rails at both sides of the flue		The shutter will fully cover the flue outlet when slid to its end position.
Install the shutter knob using a M3x8mm BHCS. Ensure the knob is fixed and with no free play	Cycle the shutter door through its full range of travel to verify smooth operation.
For a 2-pin fan only, use pliers to open the square access hole at the base of the flue. This step is not required for 4-pin fans.		Depending on your power brick placement, extend the wires to the required length.
Route the wires through the designated pass-through holes on the flue, as shown above	Install the 7530 fan into the rectangular opening. Secure it to the flue using hot glue which helps to dampen vibration noise too.
Install four 6x3 mm magnets into the designated holes on the fan bracket. Ensure the polarity is the same.	Install four 6x3 mm magnets into the designated holes on the filter box. Confirm correct polarity to ensure magnetic adhesion to the fan bracket.
Secure the fan bracket to the flue using an M3x8mm BHCS. Do not over tighten to prevent thread stripping.	(optional) Secure the 7530 fan to the fan bracket using hot glue.	Install the carbon box into the filter box.
Fill the carbon box with activated carbon pellets just above the indication fill line.	Press the HEPA filter into the filter box until it seats fully. The fit must be snug.	Clip the filter box cover onto the filter box.
Assembly of ventobox is complete.

VENTOBOX INSTALLATION GUIDE (2-Pin Fan Configuration)

Apply a 20x20mm piece of VHB tape to the back of ventoBox	Home the printer to raise the build plate to its highest position. Use a screwdriver to release the cover on the left side of the P2S.	The cover was secured with factory-applied adhesive and may require some effort to remove.  This cover is no longer needed for ventoBox operation.
Route the wires through the grille.  If your wires are terminated with a JST connector, pass them through the rectangular opening located above the grille.	Remove the VHB tape liner and slot the ventoBox into the opening.  The unit should sit flush against the chamber floor. Secure the ventoBox with a BT3x8mm screw.  Torque the screw gently to prevent stripping the plastic threads.	Magnetically attach the filter box to the main unit. Wiggle the entire assembly to confirm a secure connection. Raise and lower the build plate through its full range of motion to verify proper clearance with the installed ventoBox.
The image on the left shows the ventoBox correctly installed in the P2S. The next step is to supply power. I currently run my ventoBox manually using an external 24V PSU. For PETG and PLA printing: close the shutter for single-pass filtration.  For ABS, ASA, and Nylon printing: open the shutter for multi-pass filtration.

Important Note: 

Be gentle with the 4 pin cable connectors. Take note of the connector orientation when connecting it. (top→ bottom) Red, Black, Yellow, Blue
The P2S rear panel has 3 different type of screws.  Check out the Bambu wiki on how to remove them properly Yellow marked screw: BT3-6 * 4pcs -  These are self threading screws into plastic. Do not over tighten them to prevent thread stripping Red marked screw: ST3-4.5 * 9pcs Green marked screw: M3-4.5 * 1pcs

FILTER CHANGE REQUIREMENTS

It is advisable to replace the activated carbon pellets after 150 - 200 hours of print time. The HEPA filter can last longer. You can order the HEPA filter and activated carbon from VTC3D (EU) & Voxelpla (US) web store.

CONCLUSION

To date, my designs are free to download for personal use. There is No Patreon, No Membership, No Clubs and No Subs. If you like my designs and wish to contribute to my coffee addiction and help fund the filaments/materials needed for prototyping, doing any one of the below will be greatly appreciated:

1. Post your make in the comments section and on other 3D printing social media sites,
2. Give a MakerWorld's boost,
3. Use the afflink above to purchase filaments, components or consumables. 
4. Buy me a coffee at Ko-fi or paypal.me