@Zax i ended up getting it all working by resetting all settings to default, which allowed me to home the laser to the bottom left (where the switches are)
after this i've spun the unit round 180°, because inverting the x/y for manual jogging controls didn't play nice with the home position it seemed.

@Zax Thanks i'll try that tonight,
just to confirm, is the position of the home switches as i have installed them ok/ in keeping with the expected positions in the firmware, or will the automatic homing process move the head around the frame until it closes these switches, regardless of which corner they exist on?

Hi @Zax, thanks for that. just curious, I've wired up home switches, but when i try to download the firmware '1.1 w. home switches' it goes through a bunch of steps in terminal, but then fails.
The home switches are positioned in the red circles below

If i try to send the laser to home, it moves to the position shown, which it defines as 0,0 in the controller.
also odd, is that when i use the 'trace frame' tool, it drew the box indicated by the blue arrow, can you confirm the expected behaviour of this feature?

This is a pretty noob question, but i can't figure it out.
I Built my A3, with the control board on the front, and the home switches on the front left.
I've downloaded the GRBL 1.1 from the T2 menu and installed the drivers, and enabled home switches in the software

After this, I can draw sample shapes, and trace/engrave frame, but this only draws a box ~ 5 cm x 5 cm.
similarly, i'm not clear on how to define home.
can anyone confirm what should happen when i select Machine menu > home, or presets >home?