Welcome to the SeeMeCNC Community

Those of you who use Duet electronics but don't visit the other forums may like to know that last week I released a dev build (1.17dev6) of RepRapFirmware with support for grid bed compensation. So now you can use auto calibration to calibrate out most of the height errors, then use grid bed compensation to compensate for any residual errors. It's not quite finished yet - in particular, you can't yet read in the height map from file, and long moves need to be segmented so that they follow the contours of the bed. Those should both be implemented within a week or so. But several users have tried out the current implementation, and all the reports I have so far are good.

See https://www.duet3d.com/forum/thread.php?id=499 for how to use grid bed compensation with RRF, and https://github.com/dc42/RepRapFirmware/ ... /WHATS_NEW for important notes to read when upgrading to this firmware release.

Thanks for your diligence in posting updates here, David! I know that you juggle a lot of other forums and communities, but I think you've got a pretty good following here, and I know that more people than just myself appreciate the heads up about big updates.

Keep rockin' the RepRap firmware! Thanks.

And it is working fantastically for me on a Duet 0.8.5 and Wifi. I've been testing it for about a week now. Really great for that final little tweak after a good mechanical build and calibration.

How does this work, will the firmware probe the bed in an array of for e.g. 10mm steps, and calculate a heightmap?
Thanks to Mike's heads up I have ordered the older .6 board, so I still have a lot of catching up to do

That's exactly how it works. You specify the radius and grid spacing (for a delta printer). The firmware then probes the entire bed and creates a height map file (and it's a csv file so you can look at/edit/ponder it).