Straight line curves down at top of the sheet (solved)

I see, well v0.68 limited the feed rate 635, v0.76 limited it to 900.
On my own rig, using $15=900 made the horizontal cuts near the top of the sheet good, where using the EEPROM default of 1000 gave me cuts similar to the problem in your pictures.
Maybe try using the ‘$15=900’ macro to see if that makes a difference, back it down to 850 or 800 or so to find the speed limit on your setup?

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