Some progress but still dreadful results, after further experiment this afternoon.
I reset the Esteps value back to the default 833, and the Z-offset to -1.3.
Marked the input filament at 20mm, 24mm and 28mm.
Ran Extrude 20mm, and the printer fed about 18mm of full diameter filament (~3mm or maybe 2.85mm). Ran a small test print, a 10mmx10mm square, 2mm thick, with a skirt 3mm outside the print. I had the minimum skirt length too long in retrospect.
First brim outer line came out quite squashed, and far too wide, with successive lines piling up thickly on top. I aborted the print, which looked like this:
Ran further prints gradually making the Z-offset more negative, from -1.3 to -1.45, which helped, but there’s still too much filament extruding.
I also reduced the Esteps value from the original 833 to an alternative suggested above of about half that: 410.
Saved all these changes with M500 command in the console.
There was also a significant ooze of filament from the nozzle while waiting for the hot end to reach operating temperature (which for all 3 default ABS materials is 240deg C). So I created a custom material and reduced the hot end temperature drastically to 225C.
In combination those improved things from an aborted messy blob to a fuzzy and still over-extruded but now separate brim and test piece which I allowed to run to completion.
But even this print with reduced temperature and Esteps and largest (negative) Z-offset of -1.45 is a mess.
What else can I do to get the printer working properly again?
In the hope it might help, I’ve added below the output from running the M503 command. I think it shows all or most of the current settings, and hope it will help in diagnosing what’s wrong.
I’ve had good results in the past , and hope to get it as good or better in the future, but don’t know what else to try.
< [15:42:50] echo: G21 ; (mm)
< [15:42:50] echo:Filament settings: Disabled
< [15:42:50] echo: M200 D3.00
< [15:42:50] echo: M200 D0
< [15:42:50] echo:Steps per unit:
< [15:42:50] echo: M92 X100.50 Y100.50 Z1600.00 E410.00
< [15:42:50] echo:Maximum feedrates (units/s):
< [15:42:50] echo: M203 X300.00 Y300.00 Z8.00 E40.00
< [15:42:50] echo:Maximum Acceleration (units/s2):
< [15:42:50] echo: M201 X9000 Y9000 Z100 E1000
< [15:42:50] echo:Acceleration (units/s2): P<print_accel> R<retract_accel> T<travel_accel>
< [15:42:50] echo: M204 P2000.00 R3000.00 T2000.00
< [15:42:50] echo:Advanced: B<min_segment_time_us> S<min_feedrate> T<min_travel_feedrate> X<max_x_jerk> Y<max_y_jerk> Z<max_z_jerk> E<max_e_jerk>
< [15:42:50] echo: M205 B20000 S0.00 T0.00 X12.00 Y12.00 Z0.40 E10.00
< [15:42:50] echo:Home offset:
< [15:42:50] echo: M206 X0.00 Y0.00 Z0.00
< [15:42:50] echo:Auto Bed Leveling:
< [15:42:50] echo: M420 S0
< [15:42:50] echo:PID settings:
< [15:42:50] echo: M301 P28.79 I1.91 D108.51
< [15:42:50] echo: M304 P294.00 I65.00 D382.00
< [15:42:50] echo:Z-Probe Offset (mm):
< [15:42:50] echo: M851 Z-1.40
< [15:42:50] echo:Linear Advance:
< [15:42:50] echo: M900 K0.00
< [15:42:50] echo:Stepper motor currents:
< [15:42:50] echo: M907 X1300 Z1630 E1250