Thank you for your response. I added idle(); to the loop and it works!
I agree that editing de G29 in such a way is a ugly way of doing things. I decided to try it this way because I don't think there is any function in Marlin that supports this strange way of calibrating the table. There is no probe involved in this procedure. The head presses down on the table. The amount of mm that the head is pressed into the table is a predefined number set in the eeprom by a M530 command. You have to set these numbers by hand. So it is not really an automatic bed levelling feature at all. It is incredibly consistent though, when set correctly.
Thanks for your help :)
I agree that editing de G29 in such a way is a ugly way of doing things. I decided to try it this way because I don't think there is any function in Marlin that supports this strange way of calibrating the table. There is no probe involved in this procedure. The head presses down on the table. The amount of mm that the head is pressed into the table is a predefined number set in the eeprom by a M530 command. You have to set these numbers by hand. So it is not really an automatic bed levelling feature at all. It is incredibly consistent though, when set correctly.
Thanks for your help :)