Absolute coordinate fail

To be clear, the accuracy of the machine is likely high in terms of motion. Meaning it can make accurate movements within fractions of a millimeter, typically in the range of hundreds of a millimeter and it will do this across the entire range of the laser.

Where this problem is introduced is in the precision or repeatability of the homing process, meaning locating to a specific position in space to set origin at homing.

In practical terms, this means that between homing, you should have highly accurate motion. Across homing you’re likely to get much more variation.

Consider that most people with the original D1 do manual homing, meaning they physically place the laser head to the top-left before starting the machine instead of using the sensorless homing mechanism. You may want to actually test manual homing to see how precision compares to the sensorless homing process. Many people can’t get the sensorless homing to even work as the laser module will crash into the sides of the machine harder than expected.

I haven’t seen any reports on how precise the homing is on the Pro machines with physical switches.