Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4233620.
Of course, cats are cute. But two of them with much, much fur killed my vacuum cleaner robot meanwhile three times. There is a constructive issue on the main brush motor. There is a wide gap between the motors case and the output drive gear showing the naked axle. Here the hairs are wrapping the axle, squeezing between case and gear and brakes massive the motor. Often there comes the message "brush blocked" and the motor becames very hot and produces hot smell. Over the time this also affect the internal motors mounts making the rotor jiggling within the case, making a lot of noise and finally blocking complete. To end the necessity to cut the axle free with a long scalpel and peeling the hairs off with a tweezers every two weeks and to keep the fourth motor a bit longer than one year I made a protector which prevents the hairs from wrapping around the axle. Two of these protector parts closes the gap on the motor without braking it.