3.1.0-RC2 firmware for Prusa i3 MK2/S/MMU

3.1.0-RC2 firmware for Prusa i3 MK2/S/MMU

Description of changes with respect to RC1:

Linear advance

Using linear advance with colorprint (M600) didn't work correctly. It was possible to reach state where printer stopped working and also temperature regulation didn't work. This is critical issue which can damage printer.
More information about this issue can be found here: #245. This has been fixed. For users who are currently using 3.1.0 - RC1 it is highly recommended to upgrade to current firmware version.

We currently recommend following settings for printing with linear advance (for 100 mm/s):

• PLA: M900 K30
• ABS: M900 K30
• PET: M900 K45
• Multi material printer: M900 K200 for all materials

These settings are quite conservative and for some objects better results can be obtained with slightly higher K values.

Wizard

Fixed loading filament in multi material version. Translation to all supported messages was added.

SD card menu sorting

Sorting files in SD card menu was overally improved. Sorting in subfolders now works. Maximum number of files which can be sorted is currently limited to 100 in one folder. Also SD card can be now pulled out from the printer during sorting process.

Check if file is complete

If file is not complete, user is informed by warning message about it and he can decide if he will continue printing anyway. If user choosed not to print incomplete file, there was bug which caused, that printer executed some movements. This has been fixed.

For this check we search for M84 (disable steppers) in last 10 000 bytes of gcode file. This works well with our print settings. If you don't use our print settings, please add M84 to end section of your gcode.

"Slow printer" issue fixed

More information about this issue can be found here: #226

Other

• M20 (list SD card) and M110 (set line number) fixed
• Host keepalive messages furthermore improved