I am not at home where I can check this otherwise I would... So I'm hoping Peter sees this and can comment. Does OB Control v1.0.390 have the 4th axis features on it like what is here in this attached image?
4th axis was added way back https://github.com/OpenBuilds/OpenB...e5deeb9ca706b7f599609e64bc/CHANGELOG.txt#L138 in V1.0.333 already (In 2022) You just need a 4-axes grblHAL controller attached, for example if its a BlackBox X32, flash it as a 4-axes machine from Wizards and Tools > Firmware flashing tool > Machine style > 4-Axes > Flash Once its a 4-axes firmware, then the A buttons appear NB backup settings before doing so as reminded onscreen in the flashing wizard too... Changing number of axes WILL wipe all settings. Don't forget to backup so you can restore after flash. Also, remember to set $376=1 in Grbl Settings to make A a rotary axis
