i have problem i think with marlin. When i do clockwise circles everything is ok. But when my 3D printer starts printing circles counterclockwise every stepper starts skipping steps. My Systems power supply is 24V 15A 350W. Running 240v ac. Two Extruders Hotbed. 6 Fans
If your system uses belts I would double check the tension. If the belt tension is OK don’t over look the set screws on your stepper motor pulleys.
I used a marker to draw index marks on the motor shafts and pulleys to see if they are slipping. Mine were. I had motors with round profile shafts and ground them to D profile with a rotary tool to stop slipping. It didn’t take much grinding and it fixed the problem.
I don’t think tension or the screws are the problem. both are tight and problem only happens when my printer is doing counter clockwise circle printing. And pelts are not slipping the steppers are stalling.
I might have to wait marlins 1.2 version. It should be little simplified.
Photos of your printer or videos of the problem? What you’re describing doesn’t even sound possible, neither your printer nor Marlin know what clockwise and counterclockwise are. It’s all just directions of motion to them, and you go all directions during both circle directions.
My printer is Hello bee prusa. I thing it might be something about he signals that controls my stepper drivers. unfortunately i don’t have pictures ore tape of the printing. i will send picture of finished piece. center of the part prints clockwise then printer changes to print counter clockwise and all is hell. I use simplify3D as slicer.
missing/deleted image from Google+
This might also be problem with my slicer
@Jukka-Pekka_Ylitalo If you think it may be the slicer then it might be worth looking at the gcode in a text editor & see if there is anything horribly different about the clockwise and anticlockwise parts?
G1 X47.501 Y82.237 E0.1194
G1 X46.682 Y84.377 E0.1193
G1 X45.970 Y86.552 E0.1192
G1 X45.364 Y88.759 E0.1192
G1 X44.865 Y91.000 E0.1196
G1 X44.477 Y93.253 E0.1191
G1 X44.198 Y95.529 E0.1195
G1 X44.032 Y97.814 E0.1193
G1 X43.976 Y100.100 E0.1191
G1 X44.032 Y102.386 E0.1191
G1 X44.198 Y104.671 E0.1193
G1 X43.315 Y104.408 F7500
G1 X43.253 Y103.647 E0.0398 F4800
G1 X43.198 Y102.821 E0.0431
G1 X43.190 Y102.657 E0.0085
G1 X43.164 Y102.114 E0.0283
G1 X43.162 Y102.063 E0.0027
G1 X43.159 Y102.010 E0.0028
G1 X43.150 Y101.727 E0.0147
G1 X43.137 Y101.318 E0.0213
G1 X43.135 Y101.153 E0.0086
G1 X43.133 Y101.117 E0.0019
G1 X43.123 Y100.476 E0.0334
G1 X43.123 Y99.702 E0.0403
G1 X43.123 Y99.691 E0.0006
G1 X43.123 Y99.685 E0.0003
G1 X43.135 Y98.922 E0.0397
G1 X43.139 Y98.815 E0.0056
G1 X43.158 Y98.223 E0.0309
G1 X43.163 Y98.131 E0.0048
G1 X43.166 Y98.050 E0.0042
G1 X43.166 Y98.040 E0.0005
G1 X43.200 Y97.354 E0.0358
G1 X43.252 Y96.568 E0.0410
G1 X43.315 Y95.800 E0.0402
G1 X43.320 Y95.750 E0.0026
G1 X43.320 Y95.743 E0.0004
G1 X43.396 Y94.979 E0.0400
G1 X43.482 Y94.232 E0.0392
G1 X43.586 Y93.444 E0.0414
G1 X43.595 Y93.385 E0.0031
G1 X43.703 Y92.660 E0.0382
G1 X43.816 Y91.979 E0.0359
this is the part when all starts fail
E values are all over
Those are probably just relative coordinate E moves.
I have to point out that the odds that Marlin and your slicer are working for everybody in the world except you are very, very low. It’s probably an issue with your settings or hardware.
first lines before F7500 everything works fine E values are 0.11 constant
I am a hardware guy. And i think that bug in the code more probable. Marlin is know of those and that kind of gcode was not in my other slicer.
i hope that marlin 32 bit adds some support for interactive gcode manipulation. sometimes i print multiple objects at the same time and sometimes one fails it would be nice if i could delete that parts g code from the print while i am still printing.
simplify 3d is good program but it is not yet finished,
@Jukka-Pekka_Ylitalo Your start gcode may not be setting relative extruder coordinates properly. Tell your slicer to switch to absolute coordinates. (Under the g-code tab in S3D).
There is zero chance of Marlin ever supporting mid-print gcode manipulation. 3D printers are just file players, they read and execute what they’re given, no more. The firmware has no idea what it’s doing or where one part begins and another ends. You’d need a host program like Repetier Host or Octoprint to do that.