[BUG] Incorrect reset value for extruder steps per unit in experimental settings

[joshuafocht]

Printer model

MINI+

Firmware version

6.1.2

Upgrades and modifications

filament runout sensor

Printing from...

USB Drive, PrusaLink, and Prusa Connect

Describe the bug

When resetting the extruder steps per unit under experimental settings it defaults to 1 not the stock value of 325 (for a mini/+).

How to reproduce

1. Goto experimental settings by holding click on the Hardware menu of Settings for 2-3 seconds.
2. Click reset extruder steps per unit.
3. Extruder steps per unit gets set to 1.

Expected behavior

Clicking reset extruder steps per second should set it to 325 not 1. (For the mini/+)

Files

https://1drv.ms/v/s!ArmBR5ZkHUhmk8tYQyPg-7nA_JrzDQ?e=joetqc

[bkerler]

@joshuafocht I'm looking into this issue.

So far I couldn't see any issue that might cause this at first sight, so I will try to emulate to see what goes wrong.

Just for reference for the other devs:

Prusa-Firmware-Buddy/src/gui/screen_menu_experimental_settings_release.cpp

Line 55 in 8a788ae

Item<MI_STEPS_PER_UNIT_E>().SetVal(config_store().axis_steps_per_unit_e0.default_val);

Being set here:

Prusa-Firmware-Buddy/src/persistent_stores/store_instances/config_store/store_definition.hpp

Line 409 in 8a788ae

StoreItem<float, defaults::axis_steps_per_unit_e0, journal::hash("Axis Steps Per Unit E0")> axis_steps_per_unit_e0;

Which is hardcoded to 325 here:

Prusa-Firmware-Buddy/include/marlin/Configuration_MINI.h

Line 678 in 8a788ae

{ 100, 100, 400, 325 } //E0 280 295

[bkerler]

Most probably caused by this :

Prusa-Firmware-Buddy/src/persistent_stores/store_instances/config_store/old_eeprom/eeprom_v10.hpp

Line 92 in 8a788ae

default_axis_steps_flt[3] * ((DEFAULT_INVERT_E0_DIR == true) ? -1.f : 1.f), // AXIS_STEPS_PER_UNIT_E0

[bkerler]

@joshuafocht Two questions:

1. Do you use the release or debug firmware ?
2. Did you try to reset the eeprom and the bug still consists ?
   Thanks

[joshuafocht]

I use the release firmware.
I do not know how to reset the eeprom, so if you can tell me how to do that I would be happy to try.

[bkerler]

@joshuafocht Using "Settings->System->Factory Reset->Reset Settings & Calibrations". But I just verified the bug happens in the simulator as well, so no need to reset the eeprom. I will try to sort out what happens now.

[bkerler]

Ok, we identified the issue and I wrote a PR for it :)

[joshuafocht]

Thanks for your help!

[joshuafocht]

Is this just a GUI issue?
Because when I tried to print it was barley extruding.

[bkerler]

It is a GUI issue leading that an incorrect value is written to eeprom incorrectly after reset. To be precise, the extruder is inverse, so in fact it isn't 325 but -325 in reality. As the value is below 1 and the slider goes from 1 to 999 (I think), the value is being set to 1.
Until the firmware is fixed, make sure to set it to 325 after resetting.

[joshuafocht]

Ok, thanks for your help!