Carbon filter made of ABS plastic. The model was superglued together.

I used a special non-acidic charcoal AP-A 2-3 mm thick.

I was not satisfied with the options available now for 5015 or 40x40. Moreover, all the air with dirty particles is mostly in the upper chamber, and I have more or less solved this problem using channels containing charcoal and a small piece of cotton filter.

I used 2 120mm fans with a power of 0.20A each, connected directly to the printer's power supply via the MP1584EN step-down module. If desired, you can add a physical on/off button or connect it via the MP1584EN module to the motherboard fan connector.

The fans are connected using the JST connector in my case. I also used 3M high temperature adhesive tape.

In addition, with this design, when printing on ABS, it makes no sense to install a separate 220 V or similar heating pad, since the entire chamber heats up from top to bottom, and on a high model the temperature is 65 degrees Celsius at a table temperature of 100 degrees Celsius.

I only used the support when creating the lintel in one place, but if you don't have any problems with the lintels, then the support is optional (a support in the form of a tree).

I also advise you to cover the bolt holes in the fan with sealant or high temperature adhesive tape.