Rather than change the steps per mm, which should be mechanically accurate and calculatable from the physical states, you could use axis scaling to make the correction in firmware.
Thanks. I'll set everything back where it was and give this a shot.
"On a Cartesian RepRap you can get prints exactly the right size by tweaking the axis steps/mm using the M92 G Code above. But this does not work so easily for Delta and other RepRaps for which there is cross-talk between the axes."
I guess that would explain why I can't seem to hit 200mm.
However, I suspect that something is off mechanically. Loose bolt, stretched belt, binding carriage. Something like that.
I noticed that I had removed the belt tensioner springs at some point and forgot to replace them. I put them back on but they didn't make a difference. Everything else seems solid.
I just printed out an 8 pointed asterisk shape that is off by the same amount in every direction. That makes me think that it really is a scaling issue somewhere.
Did the top of your M122 get cut off? I was hoping to see the firmware version string in there as well.
M122 is complete. My (ancient) firmware version is 1.17e (2017-02-10)
You're missing the X Y offset of the probe from the nozzle.
I'll add this.
Can you try lowercase config.g? M98 P"config.g"
Macro file "CONFIG.G" not found.
It's echoing upper case, but I'm definitely entering