Hi: You could rig up a laser pointer to project a dot (dollar store variety). The pointer could be mounted on an angle somewhere on the Z axis so that it travels with the torch.
The dot will still be reasonably circular , even if the laser is tipped on a slight angle.
Option #2 would be to create a fence, that is plasma cut from some scrap.Set your 0,0, and cut out the fence from the scrap (don't move it after).Now you can lay your parts into the corner of the fence,and maintain a repeatable part 0.
regards
regards
----------------
Can't Fix Stupid