Wall-mounted plastic bag trash bin

I needed a trash bin for my printer's rejects and extra filament. I used to duct-tape a plastic food baggie to the side of the table, but I wanted something small that I wouldn't have to hold open all the time.

I made this, it's a rim that you stuff a plastic bag through, and it holds it open. Mount it to the wall (or the side of your printer) and easily remove it when you want to empty the trash or change the bag.