up box lid spacer for external filament

i needed to space a lid on an up box for non up brand filament so i designed it to atach to the little rubber feet on the lid.
the short is about a 10 mm gap and the final is about a 20 mm gap.
they are tested and being used at a 3d printing shop as a way to use non up filament without it being a nuisance to line something up under the legs