Z-probe (BLTouch) and dual z axis help on Duet 3

triumphantduke

So new finding... Plugging in BLTouch to io2 had no success, BUT simply plugging into io8 works now?

Should I do a warranty claim @dc42? I had this same issue when with fans, some plugs on board seem to not function and changing to a different one caused the fans to work too

stereo

YES, in 8 work. thx

triumphantduke

new nuance found, to successfully save bed mesh grid (G29), you need to have a memory card hooked up to the duet 3 board. Running mesh bed compensation will not automatically understand to save to SBC if there is no mem card on duet 3, and I didn't find a way to point it in the right direction. After it runs, it will save a file to the board, cool but now you have to take the sd card out from the duet 3 and manually transfer that file from the duet 3 sd to your SBC sd card in the same directory as config.g (easier to just connect to your SBC through web and drag and drop the file.). On the plus side, it's time for my first test print! woohoo!

gtj0

This was just fixed but I don't think it's been released yet.
https://forum.duet3d.com/post/111473

stereo

@triumphantduke Does it make sense in SBC on a regular printer with 4 motors? What is it that they all rush about with it?

triumphantduke

@stereo for the low number of motors, probably no biggg deal for printing. BUT it makes a huge difference in the web/user interface speeds for only 40 dollarsish for a raspberry pi. Then you get the added benefits of taking pictures/streaming while you print, incase youre into that

triumphantduke

uploaded my config here... first print went ok! but need to get some part cooling going on for PLA

https://github.com/murtagh1/Cartisian_Duet3_RRF3

dc42

I assume you have a Duet 3 version 0.6. Pin io2.out is not PWM capable, so it cannot be used to control a BLTouch. Use io4, 5, 6, 7 or 8 instead. I am sorry I didn't spot this earlier in your config.

brendon

Thanks @triumphantduke for posting all of your work along the way. The wiring connections you mentioned and sharing your git repo for your config.g were very helpful for me in getting G29 working in only a few minutes. If you have the bltouch working on your end, could you mark the thread 'resolved' so people know that it contains an accurate solution?

triumphantduke

@brendon I'm glad it helped! Sorry, yes i should mark it as resolved. Still working on slicer settings, but hopefully will zone in on something functional!

triumphantduke

@dc42 Thank you!

dc42

I have updated the instructions on connecting Z probes to include how to connect a BLTouch to Duet 3.