Best posts made by mule

@OwenD It is not a defective driver, because if downgrading the firmware to v3.4 everything is working fine again.

Just a quick info:
The picture of the adafruit LIS3DH on https://duet3d.dozuki.com/Wiki/Accelerometers is misleading because the V3.3 from the duet is connected to 3Vo (Output) instead of the VIN (Input) pin. Maybe it is better to remove it.

@gloomyandy
Some of my findings:
Nr. 1: The purge line is not being completed because the extruder runs backwards after printing about half of the line
Nr. 2: Line is not being printed because the extruder runs backwards
Nr. 3: The extruder motor stands still and neither moves forward nor backwards. Therefore no filament is being extruded until the end of the whole print job.

Findings: There is not only an issue with retracting instead of extruding but also with a complete stop of the extruder motor. Looking at Nr. 1 and Nr.2 it seems to me that the extruder runs backwards whenever the y axis is moving from the front to the back (Y increases).

Hopefully this helps.

@gloomyandy Sorry, of course you're right. Please find attached the the config.g and the macro (PrintStart.txt) including the code for printing the purge line:
config.g
PrintStart.txt

@dc42 I can confirm that the new firmware fixes the issues. Many thanks for the quick fix!