Spent half the day tearing down my shark robo vacuum with the laser guidance rotor on the top. It has about 5 secret access points, and comes apart in about 10 layers, the hardest is getting the lid off the rotor. Mine was having trouble with the laser guidance rotor getting seized, the robot would just stop in its tracks and throw an error. I tried blowing it out while rotating it back and forth, it ran for a couple more hours then failed again. Turns out shark has a video recommending doing exactly that, but with a can of air.
After finding my torx drivers and tearing down everything, desoldering the magnetic rotor coupler, using a heatgun in 3 places to remove parts glued together, I found out the drive motor is underpowered and has cheap bearings that sieze from moderate humidity. Apparently it's powered from a 3.3 volt supply and isn't speed controlled, based on first glance. I disassembled the rotor assembly and found a single hair stuck to the drive belt, where it should have been sealed. The rotor was off center. It rides on a 1.25" bearing screwed in place with 3 screws on the inner and 3 on the outer raceways, making it convenient to replace if you could find one. The motor is coupled to the rotor with a band under tension, which achieves an unpredictable torque requirement, particularly at low RPM. The tension on the motor is demanding on its cheap brass bearings, and the cheap steel shaft can rust. At these low RPMs and low torque, the design is only functional under ideal conditions. After full disassembly, cleaned the bearing and motor out with an air compressor, lubricated it with graphite/silicone spray, put it back together (centered this time) and now have it running on a bench supply to test if it will bind again after 12 hours.
I don't know if these things are worth the trouble.