Hello,

What is the best Marlin version for delta printer ?
I've seen many versions but witch one can I use ?
I'd like to use M666 command.

Best regards,

I am using Rich Cattell's fork of Marlin which includes his work on a G30 A auto-calibration routine. I use an M666 command to set my height after the calibration finishes followed by an M500 to save the changes to the EEPROM.

You need exactly Marlin?

Try Repetier firmware - much better and stable than Marlin. Movements are smoother, graphic LCD isn't affecting print quality (pauses during print due to LCD refresh) so much and so on. Very good firmware. I have tried both original Marlin and Repetier firmware.

Now I'm using Duet electronics with dc42 firmware (highly recommend! excellent hardware and firmware!)