I changed the filters for the laser cutter.
I didn’t touch this one but probably needs to be looked after soon. I’ll buy some charcoal next time I’m at the store.
There was a 4 pack of filters behind the laser but they are the wrong size (15.5x24.5) so I bought some new ones from Home Depot that are the right size.
I washed and rinsed these several times so they are pretty clean now. I dried as best I could by air drying and patting with paper towel. They were next to impossible to get back in so I reused the box from the old furnace filters as a support. If I can find the time I’ll build a more permanent sliding support for these (with @LCC blessing of course).