On my E3D-BigBox/Rumba with Marlin 1.1.x-bugfix I observed irregular bumps on the outer wall. Looking closer I realised, that at the position of the bumps a very short speed drop occurs which leads to a short over extrusion.
Looking into the gcode (Cura 2.6.2) I found always some points located close together exactly at the position of the bumps.
I edited the gcode by hand and removed the points laying close together and the speed drops and bumps disappeared.
The attached image (Gcode_Plot) shows the points plotted for one outer wall and the printed parts before and after my editing.
Could it be, that a processing limit of the Rumba board is reached if the points laying to close together for a certain print speed?
Looking into the gcode (Cura 2.6.2) I found always some points located close together exactly at the position of the bumps.
I edited the gcode by hand and removed the points laying close together and the speed drops and bumps disappeared.
The attached image (Gcode_Plot) shows the points plotted for one outer wall and the printed parts before and after my editing.
Could it be, that a processing limit of the Rumba board is reached if the points laying to close together for a certain print speed?