I recently upgraded my Creality Ender 5 with an SKR Mini E3 V2.0 running Marlin 188.8.131.52. The printer has also been modified with an all-metal hotend and a direct drive conversion kit that uses the extruder stepper motor. In test prints of the XYZ calibration cube, I have found that the edges of the cube are rounded over. After some research, it appears this is due to either the acceleration/jerk settings or the junction deviation settings.
The issue now comes in that no matter what setting I change, the prints do not change. Currently in the Marlin firmware, I found that the Classic Jerk is disabled in Configuration.h line ~786. The default JUNCTION_DEVIATION_MM is 0.013. Since Classic Jerk is disabled, Junction Deviation shows up in the menu under Menu --> Configuration --> Advanced Settings. I printed 4 cubes for 4 different Junction Deviation settings: 0.013, 0.075, 0.130, 0.300. All cubes have the same characteristic over-corrected corner with no visible changes (Picture below)
My questions are:
- Why aren't the prints being affected by changing the Junction Deviation setting via the menu? The Junction Deviation setting is stored in memory using Menu --> Configuration --> Store Settings and I have confirmed the values remain in memory after cycling the printer.
- If Classic Jerk is disabled in Marlin firmware, would an M205 X[Jerk] Y[Jerk] Z[Jerk] command before a print enable Classic Jerk for that print?
- What happens if an M205 command is sent that sets XYZ as well as J? (e.g. M205 X[Jerk] Y[Jerk] Z[Jerk] J[Dev]). Would it ignore Classic Jerk values if Classic Jerk is disabled in firmware?
I have read through the following posts already
- Setting Junction Deviation in firmware has no effect
My next steps:
- Re-enable Classic Jerk in Marlin and see if the print behavior changes