Well, unfortunately, it is hard to tell what you are doing.
First, tinyG is a V8, loaded with build 412.XY ?
Also note that build 429.01 is now available and is a more up-to-date EDGE version.
You are running your gcode with tgFX? What version (build) ?
From your description, it worked runs 1 and 2.
Do you reload material between runs, or just rest a zero point on one piece of material?
Significant power dips could be an issue, as could excessive noise from spindle(or vacuum) on the power lines.
If you are pushing your gantry around by hand, to load new material or etc., the motors could be inducing noise back into tinyG.
When I run jobs, I set my zero point, with cli commands or jogging, then reset tinyG (reset button) before starting the Gcode run.
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This reply was modified 10 years, 6 months ago by cmcgrath5035.