Disk for furnace filter

thingiverse

I blew up the original mask by 115% to slap on the 3/8 thick window seal, which was a bit too tiny. I also tossed in this 1.5 mm disk to fill the gap when using a furnace filter cutout - it's got a diameter of 90 mm and is 1.5 mm thick. To get back to the original 100% mask, just shrink my disk down to 87%. Have fun!