@o_lampe it wasn’t, as it happens. I redid the firmware from scratch using the RRF configuration tool which gave a slightly different setup to the one I was working on when I asked the spindle question.
Ironically having fixed the issues I’m back to essentially my original spindle config.
What I’ve ended up doing to solve that original issue is break out heater3 (and 4 for the laser) and use those to PWM drive an external MOS chip that level shifts the PWM to a breakout from the fan 5V… which is then the right level and “side” of the spindle controller to control it properly!

It seemed to work when I tried it at 9:00 last night but that’s my cutoff time for trusting my brain not to do something stupid so I’ll be doing more tests and checks this afternoon.

@fcwilt said in Possible bug with local variables use in config.g?:

@Mr-Yod

I've always used {var.variable_name} rather than just {variable_name}

Frederick

🤦

You are righ... 😅

I am very thankful I found this thread because I was having the very same issue and, after some experimenting with your scripts it works better for me too now.

However, I do have a question: why there is no M915 command on these routines? I assume if ignored it assumes a certain value lie S3??

I mean, I tried with and without M915 and it works, so... I am confused, somehow

Got it. I recently moved the printer to a new place - from one flat and level surface to another - and I didn't bother to re-level it. That came to bite me now - one of the corners (the front right) was considerably lower than the other ones, introducing a twist into the entire frame that was really hard to spot. Re-leveled the feet, now everything is back to normal (pun intended).

Ok ... that makes sense 👍