In the menu MOVE - Get position - where does the U: stand for?

[Rick (Technical Evangelist)]

This might be worth your review.

GRBL 4th Axis, Lightburn, Rotary axis, GRBL Mega 5X

I have just started to use Lightburn with a newer version of GRBL intended for the Mega 2560 board plus or minus the RAMPS shield. It is version 1.1L and is intended for true 4th (and 5th and 6th) axis movements. It is available on Github. Search for GRBL Mega 5X. It has Laser mode of course. It can easily be loaded with Arduino IDE or with the Hex file and XLoader. In the past I had some success mapping a curved surface and burning to that with a ‘fake’ 4th axis using one of my Uno linear axes…