I translated his post with Google Translate, keep that in mind.
Setup for a Rotary you need to know
- type of rotary, wheel (roller) or chuck
- steps/rotation from the motor driver of the applied axes
- gear ratio between the motor and driven object.
I did a short post on this with a few photos.
The test button does work, or the machine isn’t configured correctly. These are digital, at least up to the motor.
When you get a slop error it’s usually because it’s being driven out of it’s work area, either by overscan when doing a fill or it knows you’re too close to the edges for the artwork.
It operates the same as your table, so if you’re too close to the edge, you will get some kind of error.
I’m going to assume you use the Y axes, ensure, once your rotary is attached and that the X and Y coordinates are somewhere within the work area also that the artwork won’t drive it out of the work area.
I don’t use absolute coordinates, I put my head where it’s on the cup/mug and press origin, from then on I have start from set to user origin.
I commonly have job origin selected on the center left as that’s where the mugs manufacturer logo is placed.
Maybe @misken can help here… I’m hoping he speaks French and can make sense out of the translation. 
