It work on 2.83 today. It will be very cool to be have an option to just draw the 2D arch, plus an option to continue with another arch just like AutoCAD does. But I am happy with what you have made. Thanks you very much.
I am not having these issues locally. I just tested installing “three_point_arch_280_v012” with 2.81a and it worked without having to make any changes to the code.
You can have the tool exit after confirming the initial arch outline if you disable the “Enable Extrude” option in the add-on’s preferences. I’m not sure what you mean by “continue with another arch” here, do you mean go immediately have the tool start placing points for a new arch after one arch is completed?
Were you using the latest version? The axis jumping was a problem in a previous version, but this should be fixed in 012. I didn’t have this issue when testing (012) in 2.81a.
I made a similar feature in NP_Station - a poly tool that extrudes automatically when you close the polyline. If you would like to keep just the 2D shape simply press escape while extruding and the operator reverts to last completed phase - 2D poly. If you would like to undo the whole poly simply press esc while in the first phase or delete afterwards. I found this procedure somewhat more convenient and faster than editing an addon preference (because of constant change) or making a separate tool. It works quite nice in practice.