when we print technical materials, they release toxic molecules. even our beloved X1C releases harmful odors and materials during the air expulsion phase via the rear fan. a double HEPA filter combined with activated carbon greatly reduces the release of these molecules. 

For X1C/P1S using magnets, in order to be able to "attach" it to the back of the machine.

for the printing I used PLA BAMBU MATTE BLACK, but you can very well use ABS, PC, ASA, PETG.
3 wall 15 infill gyroid 5 top 5 bottom

the inserts used are M1 M1.4 M1.6 M1.7 M2 M2.5 M3 M4 M5 M6 M8 inserto in ottone dado zigrinato filettatura dado per stampaggio a caldo doppio dado per iniezione Twill - AliExpress
4xm3x25mm
HEPA filters https://amzn.eu/d/3bIzf4U
carbon https://www.amazon.it/gp/product/B06XG5TFTN/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1