Paper bag rim

thingiverse

Keep your paper bag open for adapted use, like a small trash bin. Fits common 300mm x 175mm size of bags. Slight variation in bag size doesn't matter because you can always fold your bag at 175mm if it's not already that. Print two, one for each end. Instructions Trial-and-error testing showed that a 2mm gap is good clearance for kraft paper. Then 15mm height is needed at minimum to keep it from falling off the bag. It could be taller, but then it would be more material to print.