Hi guys,
It's about 2 month i'm trying to solve a problem with my mini kossel: during the first layer on the perpendicular of the Z tower the head is too high under the tower (the filament doesn't stick or doesn't stick enough) and on the opposite side, the head "crashes" in the bed, scratching the kapton tape and jamming the extruder without extruding material.
I tried to play with the hardware and the software without success. the belt are well tensioned, the endstops are under 1mm of difference each other, the DELTA_RADIUS is set correctly for a flat plane of movement. I also runned an auto-calibration (Command: G30 A) from RichCattell's firmware. The calibration run correctly: it adjust the endstops, the radius and the rod lenght, ending with all the 7 point within 0.015mm. Sometimes it take only few iterations, sometimes it runs out of tries (more than 100 iteration). When everything goes well i issue a M500 Command and store everything in the EEPROM. Also when I run the G29 command the report is (more or less) as aspected:
-0.010 -0.010 -0.010 -0.020 -0.030 -0.030 -0.030
0.010 0.010 -0.020 -0.050 -0.040 -0.040 -0.040
-0.030 -0.010 -0.020 -0.030 -0.040 -0.050 -0.040
-0.030 -0.050 -0.030 -0.030 -0.020 -0.020 0.030
-0.020 0.020 0.020 -0.020 -0.040 -0.050 0.010
0.040 0.040 0.010 -0.030 -0.040 -0.040 -0.040
0.020 0.020 0.020 -0.020 -0.030 -0.030 -0.030
Then i manually checked some points (with the paper test) and I notice that:
X0 Y-50 => Z=0.40
X0 Y50 => Z<0
X0 Y0 => Z=0.2
X50 Y0 => Z=0.1
X-50 Y0 => Z<0
then if i run again a G28 and a G29 command it reports strange numbers but that agrees with my manual measurements.
Why this is happening? it forget how it's made?
Can someone help me please?
Thanks to everyone!
PS: this is the G29 command of how i need the bed to be for a pretty leveled first layer (but still crashing):
0.420 0.420 0.420 0.380 0.330 0.330 0.330
0.300 0.300 0.310 0.310 0.310 0.290 0.290
0.150 0.200 0.220 0.220 0.230 0.220 0.260
0.050 0.070 0.110 0.130 0.140 0.160 0.210
0.000 0.020 0.050 0.040 0.020 0.030 0.100
-0.010 -0.010 -0.040 -0.060 -0.040 -0.060 -0.060
-0.020 -0.020 -0.020 -0.090 -0.130 -0.130 -0.130
this are the parameter of last calibraton:
Steps per unit:
M92 X100.00 Y100.00 Z100.00 E770.00
Maximum feedrates (mm/s):
M203 X150.00 Y150.00 Z150.00 E150.00
Maximum Acceleration (mm/s2):
M201 X4000 Y4000 Z4000 E4000
Acceleration: S=acceleration, T=retract acceleration
M204 S3000.00 T3000.00
Advanced variables: S=Min feedrate (mm/s), T=Min travel feedrate (mm/s), B=minimum segment time (ms), X=maximum XY jerk (mm/s), Z=maximum Z jerk (mm/s), E=maximum E jerk (mm/s)
M205 S0.00 T0.00 B20000 X20.00 Z20.00 E20.00
Home offset (mm):
M206 X0.00 Y0.00 Z0.00
Endstop adjustment (mm):
M666 X-2.10 Y-1.82 Z-3.28
Delta Geometry adjustment:
M666 A-0.16 B0.42 C-0.26 E0.00 F0.00 G0.50 R104.46 D213.25 H228.34 P0.00
PID settings:
M301 P20.23 I0.87 D117.01
