A bumper for the pictured Rohde & Schwarz test instrument feet, used in various models between the late 1990s until today. To be printed with a durable, flexible material, these bumpers slide over the stock feet and are recessed to fit snugly while still being removable. They look similar to the original light blue rubber parts, but were modeled from foot dimensions and a picture rather than a physical part, so they are not exact.
White (original feet are light blue)
Prints fairly easily with good TPU settings. On my i3 MK3, setting retractions to 2mm or just under and increasing retraction speed reduces stringing considerably, a little overextrusion is helpful.