GreartisanDC 12V 300RPM Gear Motor High Torque Electric Micro Speed Reduction Geared Motor Eccentric Output Shaft 37mm Diameter Gearbox

I used it on my lifesize R2D2 to rotate the dome. Works perfectly, wired it up no problem.

Great quality motor, can't review long term robustness but works great for powering a droid head..

Cannot really comment on product as I returned it after studying spec and reading reviews much more carefully. I wanted a small but high torque geared motor. Although it quotes a rated torque of 4Kgm.cm some reviews implied this was not possible. Also other products in the range with differing gear ratios gave ratings that were totally different compared to their gear ratio. This made me unsure so I returned item. I subsequently found a similar (but clearly different manufacturer) motor on a 'robot maker site'. This quoted stall torque and amps along with running torque and amps etc etc. I purchased that one with more confidence (and found motor exceed the torque quoted - did not stall even at over 12Kgm.cm).

This review is for the 12v 1000rpm motor with offset drive shaft.The shaft has considerable play in it. I used it for a guitar pickup winder with a 100mm wooden plate attached to the shaft with a flange coupler and the plate is really too wobbly to do the job accurately.Maybe I just got a bad one - I don't know. The shaft is mounted in a bearing, I might try taking it apart and replacing the bearing, but I'm not sure if that is even possible.Also the gears are noisier and looser than expected, which isn't a problem in itself abut I suspect they wouldn't last.By the time I got the machine built the return period had expired so it just a waste of money at this point.It responds fine to my speed controller and the maximum speed seems accurate although I haven't checked it.I have bought a much cheaper smaller (25mm) motor to replace it (£6) which has a much tighter shaft with less play.EDIT 30/9/23 Posting this in case it helps someone with the same issue. The looseness can be adjusted!I figured I had nothing to lose so I removed the two screws that attach the front of the gearbox and prised the top of the gearbox off.On my 1000rpm offset shaft model there is a large gear attached to the end of the shaft - it is held in place with a little steel flat bar mounted on two screws and it has a lump in the middle which presses against the centre of the end of the shaft to hold it against the bushing. On mine this was not actually pressing against the end of the shaft, so I removed it and bent it a little with pliers and put it back so that it pressed the gear down and the shaft into the bushing tightly. This stiffened up the whole shaft and gear assembly and made it much stiffer to turn by hand as well as eliminating the wobble.So problem solved for now. I don't how long it will last before it works loose again though.

Very weak motor. The motor does not turn under load, it just buzzes and stalls.

No details about arrival, but worked out a gearing, very nice too.