Once the print bed is covered in Bambu liquid glue is an instant dust magnet, I wanted a dust cover but couldn't find one.  I use the Bambu Liquid Glue for Build Plate, and just fill in with the glue pen where my last print was, rather than cleaning it every time I use it and washing off all the glue from the plate.  This uses less glue so the tube goes longer before replacing.  But, the glue gets dust sticking to it that would weaken the adhesion as it's not a pure glue/filament bond.  So, print this, flat side goes up when in use so it doesn't stick to the bed. It's a fill 256x256 print, it's not pretty so 2.4 Layer on a 0.4 nozzle is fine. There is some reinforcement underneath so stop it sagging. Fits P1/X1 if for any reason you want a bed dust cover.  Only use it on COLD beds!