Hi all, I did my best to find information on how to fix this, but unfortunately I did not come up with a result and I am left clueless. Hoping you don't mind me creating a thread for this issue. I have been using Estlcam in the past for my CNC router which worked great. I found the Openbuilds control software and I thought why not have a look at that software as well? The situation is that I have bought an Arduino uno + GRBL CNC shield. I have the same setup on my CNC router and I am now building a laser cutter. I flashed the GRBL software using the GRBL flashing tool inside the Openbuilds control software. Everything went fine and the controller comes online: [13:24:54] [ connect ] Firmware Detected: grbl version 1.1g on COM6 However, I am unable to move any axis using the Openbuilds control software. As far as I can tell there are no alarms active and the controller state is Idle. If I flash the Arduino uno with GRBL using Estlcam everything works. What am I doing wrong? Thanks a lot for your time.