In my dining room we have a couple spare chairs against the wall. When cleaning these chairs Roomba bumps the legs, which causes the chair-back to bang against and mark the wall.
These little bumpers attach to the back chair legs and extend back far enough to keep the chair 1cm or so away from the wall. They are designed to be printed with a flex filament like TPU.
You will probably need to customize these with the width and depth of the your chair's legs. You can also customize the distance from the chair leg to the wall.
Note: I printed my prototypes in bright orange, because it's what I had handy. The final versions are black, but the orange shows up better in photos.
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