After a few weeks of use, I come back to my initial comment and I withdraw my first 2 star rating (he remains more than two).
Indeed, I ordered two of these robots and they both have the same defects.
After just ten uses, I noticed a drop of grease fell into my food preparation. By looking more closely, I find that the head which attach the accessories and all fat (and this is not the cooking oil!).
Having no desire to return the KMX51 which is nevertheless under warranty, so I filed the robot's head.
After removal, I found two major flaws:
> Fault 1: The head which attach the accessories is driven by a shaft that rotates within 2 bronze rings. This type of assembly requires no lubrication and thus has no sealing. Excluding this assembly was done with a lot of fat. This is also from there that have cast the fat droplets. Although it is probably called fat "food", it is better not to have in our cooking.
This is a wrong procedure or assembly faults.
Remedy: degrease bronze rings and shaft which rotates inside (CAUTION Do not grease the pinion located in the shaft!).
> Fault 2: the central axis which is normally greased, has a groove in which is received an O-ring for sealing and thus prevent grease from flowing into the bowl. Unfortunately, this O-ring due to its too high section, is systematically sheared during assembly of the head of the robot. I have tried several of this section and all have been sheared. The sealing part is no longer assured and grease can flow into the bowl.
To solve this problem I put a slightly smaller section of O-ring, then I have made several times the installation and removal of the head, no shear point and sealing is perfectly assured. This is a design flaw (section too big joint).
Since these two actions have been completed, everything is back to normal and fat no longer flows.
I hope this review will help if you experience the same inconvenience me.
