Dear all, thanks so much for the advice, the loose grub screw was the root cause which was definitely in my blind spot! Learnt a lot and really appreciate the support, looking much better now with some tweaks.
Neil

@marcossf thanks will check it out!

Hi everyone, I've been using Fusion360 so far and the free trial is coming to an end
Does anyone have a recommendation for alternatives?
Thanks!
Neil

Awesome thanks both!

Hi All, hope you're well. I'm getting my head into this and have a couple of [newbie] questions:

1. I'm setting up a z-probe but there is no z probe value on display - should I do the the calibration on the classic DWC then switch over to CNC? Same applies for endstop switches I guess.
2. The set work Xyz button: does that link to a macro or does is just trigger a G92 command?
   Really think this is a great project!
   Thanks,
   Neil

Dear all, thanks so much for the advice, the loose grub screw was the root cause which was definitely in my blind spot! Learnt a lot and really appreciate the support, looking much better now with some tweaks.
Neil

Thanks folks for the opinions really appreciate independent advice! I will focus on the mechanicals and re-test the square / diamond combo.
Neil

@cjm here is the result: Still looks weird and clearly incorrect. I used a 1/4 inch bit so slight dimensional difference but does not explain for me the strange behaviour.
Would you mind sharing your config.g file with me please?

Thanks,
Neil

@cjm just seen your post - many thanks I will try it out tomorrow.

@whopping-pochard that's right just trying to keep it simple with G1 commands in one file. I've added another test (fig 3)
and it appears to act erratically. Mechanically it looks fine, it's belt drive on X and Y NEMA 23 FYI .
steps.g

Thanks very much for your assistance, the good news is that the firmware upload (RRF3.2RC2)went fine, the bad news is that the mis-behaviour is still present.
For example a simple square is not completing (fig 1)
or a sequence of simple moves (fig 2) .
This time I've uploaded the config and gcode files for the above if someone could please spot the deliberate mistake
arc.g
squaretest.g