[M200 / M300] Marlin 2.1.x firmware release

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42

Hi,
Never posted here before. I have a M300 with V04 hardware but the Marlin download only has V05? does that mean the V04 hardware M300 isnt supported with marlin?

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43

Can everybody tell me what slicer your using and printer profile ?

thankyou

44

I tried downloading marlin on my m300 but it downgraded from my original firmware instead of upgrading to marlin, what can I do to actually get marlin working?

45

I think that might be the case, marlin didnā€™t work on my m300 either.

47

Hi!
Iā€™ve connected my RaspberryPi Zero 2W to the debug header as the instruction on github said: RX to TX, TX to RX and GND to GND. I wanted to use OctoPrint, serial connector is ON on my raspberry, but OctoPrint canā€™t connect to the printed by any chance.
Also after this update bed temp canā€™t be reached, it stopps at around 70 deg and then printer shows an error of bed heater and reset is needed. Everything works on earlier firmware version tho.

EDIT: After some digging I think that my problem with OctoPrint is not with connection but with baudrate as my RPi canā€™t handle 250000, so Iā€™ll need to buy a USB-UART converter or to ask developers to change baudrate for example to 230400 if itā€™s possible.
Also the problem with bed heating might be that marlin expects it to heat faster, and if it wonā€™t reach temp fast enough it ends with an error, because if I heat it to 65 deg and then set temp to 70 deg everything is fine, but not if I set it to 70 at once. Maybe changing bed temp check from 6 to 2 or something like that could fix that issue too.

Any help much appreciated!