May 10, 2026
Description
Removable Advanced Filtration Adapter for Prusa CORE One
Note: Revision history and wiring notes are included at the bottom of this page.
I do not print with ASA often enough to keep the Advanced Filtration System permanently mounted on my Prusa CORE One. I also found that when the filter assembly remains installed while printing PLA or PETG, chamber temperatures can be difficult to keep below approximately 35–40°C, since the chamber fans have to push air through the filter.
This adapter allows the filtration assembly to be installed only when needed. The filter slides down between the inner and outer printed adapter pieces while still maintaining a good seal against the printer.
Design Features
The inner adapter includes four countersunk holes so the fan assembly can slide between the two printed pieces without interference.
The outer adapter includes pass-through mounting holes, allowing the inner and outer pieces to be assembled together first and then mounted to the printer as one unit.
The two pieces may also be mounted separately if preferred.
I originally planned to use heat-set inserts, but after testing, I found they were not necessary.
A STEP file is included for anyone who would like to make their own modifications.
At the time of the original design, I had not yet modified the wiring between the fan and the xBuddy board. I later added a removable USB connection option so the filter assembly can be removed without opening the electronics cover. See the update notes below for details.
Additional Hardware Required
4 × M3 × 10 mm socket-head screws
8 × M3 × 16 mm screws
Screws between approximately 15–20 mm long should also work
The screws I used were similar to these
Print Settings
Printed in PETG
Supports should not be required, although using them will not hurt if your printer tends to struggle with small overhangs
Assembly Instructions
Option 1: Mount the adapters separately
Mount the inner adapter to the printer.
Note the cutouts on the back of the adapter. These provide clearance for the chamber fan screws that protrude from the rear of the printer.
Mount the outer adapter over the inner adapter.
Note the relief on one side, which allows the filtration assembly to slide between the two adapter pieces.
Slide the filter assembly down into the slot between the inner and outer adapters.
Option 2: Pre-assemble before mounting
Assemble the inner and outer adapters together first.
Mount the assembled adapter to the printer using the pass-through holes in the outer adapter.
Slide the filter assembly into place.
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Updates
08/03/25
Added a thinner version of the adapter.
Removed 5 mm from each printed part, reducing the total assembled thickness from 30 mm to 15 mm.
07/14/25
Moved the mounting holes down 3 mm to raise the adapter above the wire-cover opening, preventing interference when removing the cover to access wiring.
Added an angle to the standby adapter(s) for improved support of the filter adapter tabs.
Added a single-screw USB adapter for users who have the WiFi/GPIO Hackerboard installed on their CORE One.
07/04/25
Added left- and right-side standby adapters as optional mounts to hold the filtration assembly when it is not in use.
Added a chamfer to the front face of the inner bracket to prevent the filter assembly from rubbing when sliding it out.
Countersunk the two lower screw holes on the outer adapter so the optional standby adapter can be used without rubbing against the screw heads.
07/02/25
Added a notch at the top center of the inner adapter to clear the rivet in that location.
06/25/25
Added a USB mount that uses two of the existing Buddy board mounting screws on the rear of the printer.
The mount is designed for a panel-mount USB Type-A connector.
I cut the original fan cable and wired it directly to the USB connector, then connected it to the Buddy board.
Wire it exactly as shown in the reference photo, with the white stripe on the right when viewed from the rear of the USB connector.
I then soldered a 4-wire male USB plug to the fan cable.
Wire order is R-W-G-B, left to right.
With this modification, the filtration assembly can now be removed without tools.
Additional Electrical Parts for USB Conversion
License:
Creative Commons — Attribution — Noncommercial — Share Alike
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