I have reset the X Axis 0 several times. The Farm Bot will attach to the tools without fail but when the bot tries to return the tools to the bracket the Sequence fails. After checking the controls the farm bot is usually off between 10-40 units. I have tried to reduce and increase speed on the X axis and nothing seems to work.
There are likely several factors contributing to the issue, another one may be controller performance. Vibration may be an important one in your setup; you can try reducing the number of steps used for acceleration to close to zero (or 0 , to disable acceleration). Or reduce the max speed to around 100.
This is the same reply that Gabriel gave in an earlier post.