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I've had an Ender 5 for about a year without problems. But just recently, the printer is not lifting the Z-axis before printing. It will home great but when it moves to print the purge line it lifts the bed down about 2-3 millimeters and the nozzle is not even close to touching the bed anymore.

I've checked the starting G-code in Cura and it all looks fine but I'm still having problems.

Current Start G-code:

M201 X500.00 Y500.00 Z100.00 E5000.00 ;Setup machine max acceleration
M203 X500.00 Y500.00 Z10.00 E50.00 ;Setup machine max feedrate
M204 P500.00 R1000.00 T500.00 ;Setup Print/Retract/Travel acceleration
M205 X8.00 Y8.00 Z0.40 E5.00 ;Setup Jerk
M220 S100 ;Reset Feedrate
M221 S100 ;Reset Flowrate

G28 ;Home

G92 E0 ;Reset Extruder
G1 Z2.0 F3000 ;Move Z Axis up
G1 X10.1 Y20 Z0.28 F5000.0 ;Move to start position
G1 X10.1 Y200.0 Z0.20 F1500.0 E15 ;Draw the first line
G1 X10.4 Y200.0 Z0.20 F5000.0 ;Move to side a little
G1 X10.4 Y20 Z0.20 F1500.0 E30 ;Draw the second line
G92 E0 ;Reset Extruder
G1 Z2.0 F3000 ;Move Z Axis up
M503
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After hours of testing (which included reinstalling firmware, formatting various SD cards, and changing G-code and slicer settings), I did find a function to restore factory defaults and that did the trick. I'm still not sure how something wrong got stored in the memory but it did and resetting to factory defaults worked.

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