Hello everyone,
I have a very weird behaviour of my extruder on my Anycubic Kossel Delta Printer. It started probably 2 weeks ago when printing a case for an arduino. There were two cylinders for buttons, the right one was printed normally, on the left one my printhead just stopped on a specific XY-Point every layer and extruded filament for, like, 300 milliseconds. I thougt that probably the model had an issue as this was the only part of the print where this happend and I didnt thought about that.
Yesterday I started printing something which has a lot of round parts, and now, I get this behaviour all the time on different parts of the print. Because of all this unwanted extrusion and as the printhead stops for a split second, it melts the plastic which is already there and adds a big blog which results in a very bad print. As the new object is mostly round, also the brim I print on the first layer is mostly round. Here, I get underextrusion (check image below). What is extra weird is, that on objects wich have a rectangular shape, the first layer has NO underextrusion… (check same image)
I also tried to use some G-Code which is about 5 months old, to check if the gcode is wrong and my slicer (Cura) is the issue, but no, I get the same behaviour of printhead stopping for 300 ms and extruding material here, too. When I printed this gcode in the past, everything was fine.
So, what did I do to try to resolve the problem (Hint: nothing worked so far):
• Rebooted the printer..
• Printed different objects to make sure it is not that specific object
• Printed old G-Code to check if my slicer is the problem
• Reflashed the Firmware (Marlin 1.1.9)
• Reflashed a backup of my Firmware (I change some stuff from time to time) from about 2 1/2 weeks ago.
• Restored Failsave on my printer to make sure no wrong setting is stored in the eeprom
• Compared every line i changed from the stock 1.1.9 Firmware to find something weird
• Did an M111 S247 and watched the debug output live in the console, slowed down the printer until the debug output came in in realtime (did not find something unnormal)
So, I am just out of ideas… Any help is appreciated.
I will add some more information here:
Printer is a Anycubic Kossel Delta Pulley (2016 Version) with Ramps 1.4 Board and A4988 drivers.
I attached some G-Code which produces the error on my side to this post
Here are Videos of the Problem, one how it looks at the printhead (issue is obtainable at 0:15 and multiple times after) [
imgur.com] one how it looks on the extruder motor (obtainable at 0:25, 0:23 and 0:12 for example) [
imgur.com]
Here is my Configuration.h and my Configuraion_advanced.h
[
pastebin.com]
[
pastebin.com]
