Marlin: [BUG] Weird behaviour / Problem after G29

[supagusti]

First, thanks for your excellent work!
I've modded my AM8 to use dualX as well as dual Z axis. Using the RAMPS board and 2 stepper extender boards I have 7 TMC 2208 (standallone) stepper drivers in total.

The issue that I am facing occurs to me in the version 1.1.9 (downloaded 2019-09-18) as well as in the 2.0-bugfix (downloaded 2019-09-19).
I'm not sure, but it could be similar to issue #6636.

When I send following G-code commands via pronterface:
G28
G29
G1 X110 Y110 F4000

after finishing the homing and bed leveling, the toolhead moves very slowly towards the X endstop and then - after it hits the endstop - moves (at full speed, only restricted by DEFAULT_MAX_FEEDRATE) to the position given the G1 command.

(-> See video: Marlin2.0._Error_after_G29.MOV.zip)

The issue occurs ONLY, when you send the commands, while the printer is moving during G28 and G29 (e.g. type fast in pronterface, or run from SD). When I wait with the last command until G29 is finished. The command G1 X110 Y110 F4000 executes as expected.

I've tried a bltouch (china clone, v. 1.0) and a capacitive probe.

The issue also occurs, when you do a M420 S0 after a G28.
I've tried to put a M400 after the G29 and also a G90 (according to the last post of #6636)

I've also attached my configs, the pins file is also modyfied to fit my needs for 7 steppers:
ConfigFiles.zip
(I've transferd the values by hand into the 2.0 configs)

Thanks in advance...

[boelle]

is this still an issue with latest 2.0.x ?

[supagusti]

I'm a bit confused now. I didn't change anything in the firmware, except for some nozzle offset values. But the issue seems to be gone now.
I just prepared to upload the latest build and wanted to confirm the issue with my current build, but it's not present anymore.

[jukisu23]

I think I'd check in.
I had the same exact Problem.
After some time I realized the following:
Cura automatically adds the nozzle lifting in the end of the print. For this it issues G91 for relative positioning.
If you don't manually add a G90 (absolute positioning) to the start gcode, it will still be in relative mode and therefore always be stuck in the back right corner.

[thinkyhead]

It has always been a best practice to put G90 at the top of your G-code because you never know what mode the machine will be in. Some printers may even default to relative mode, since that is a configuration option.

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