Hi all,

sorry for late reply. Had no spare time the last days to work on the printer.

I tried what @o_lampe suggested. I re-soldered the PDN pin so that it protrudes out of the top of the board and then connected the pin to 3.3V. There was no connection to GND. I measured this via continuity.
Unfortunately, this was also unsuccessful. The mainboard no longer started the WLAN module and I was already afraid that I had broken something. However, after removing the VIO connection to the PDN pin, everything worked again.

For no good reason, I then bridged the three solder pads on the underside of the board and soldered the PDN pin the right way round again. In this configuration, at least the enable via M17 works correctly.

I will play around a bit more in the coming days. Specially with the parameters of M569. If I find a solution, I will get back to you.

Otherwise, thanks to everyone who has tried to help 🙂

@T3P3Tony Yep, that's what I ended up doing. I spoke with Teknic support and expressed interested in the HLFB wire potentially signaling errors rather than enabled status and they filed my feature request. For now this is my solution: https://forum.duet3d.com/post/346434

@kaj
I'd choose the DM542 driver, it superseeds the TB6600 and isn't much more expensive.
The TMC drivers are very quiet, but their configuration (either jumpers or UART/SPI) can be difficult.

@phaedrux @droftarts Thank you for your response and sorry for delay on response, I finally got all the hardware and I'm with testing now the configuration and movement 🙂

Regards

There was talk to bring out a 6HC for external steppers. Any news about this @T3P3Tony ?