Update 2019-01-13: Added feet for 11 l and 22 l versions.
Simple gliding feet for the most popular SAMLA boxes from Ikea. Just insert these feet into the edge pockets of the box (see photo), then it will slide much better on carpets and other flooring materials. It should not require any glue; this may depend on your printer calibration, though.
I added the FreeCAD files, in case you want to modify this thing.
The 5 l version only needs 4 feet of one type; the larger ones (11 l and 22 l) require two of each of the mirrored versions. And yes, the 11 l feet are larger than the 22 l ones.
A little bit of sanding may further improve gliding performance.
Physicator
