Roomba horns
thingiverse
Roomba horns prevent the roomba from getting stucker under your furniture. This simple model works really great for me. I tested this for the 620 roomba model. Assembly: See the attached image for attachement of the horns to the roomba. Drill holes from behind the bumper at the red crosses (disassembly is done as described here: https://de.ifixit.com/Guide/Disassembling+iRobot+Roomba+551+Bumper/22501). Take short wood screws. If the holes are too loose, just adjust the model to get a tight fit.
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