nuroo wrote: ↑
Mon Sep 18, 2017 4:15 pm
I'll assume this firmware is running consistent perimeters around the edge of print bed for you. Assume its an end user mistake. Need someone else with a Taz 6 to confirm my result or logically its just me. I'm happy to beta test because I can revert back to old firmware if problems.
What I suspect is happening is that bed leveling is not perfect, but generally the offset is small enough that the difference is not enough to see with the naked eye. The one instance in which it becomes visible is when the Z-offset is low enough that the nozzle drags on the bed. At that point, the nozzle catches momentarily and then releases and you get the telltale dot dot dot pattern as the flow of plastic is cut off and released.
We have determined that under the new Marlin the Z-offsets need to be different. On the older FW, a Z-offset of -1.500 was appropriate, but on the new FW the value needs to be around -1.200 for the TAZ (we will change the defaults soon).
I suspect you are using the defaults of -1.500 on the new FW, which is too low, so this makes any imprecision in bed leveling apparent. If you were to try the old firmware, but lowered your Z-offsets sufficiently so that the nozzle caught in the same manner, I suspect you would also see imperfections in leveling.
I do not understand the error you got with G28. Please post the exact error message from the console. Also, let me know whether you are using Cura 1 or Cura 2 Beta.