Bypass bed compensation calibration limit

Mads794

Hello guys,
I recently got my new Modix Big 180x installed and set up
Now with such a big print area there are bound to be some warping and such.
Ive calibrated the machine countless of times to try to avoid this but regardless what i do, there is still some issues printing large items, generally on the first layer. The bed compensation macro i have set up does have the 21x21 limitation, has anyone experimented with manipulating the csv file to allow for more points?

jay_s_uk

@Mads794 its a limit in the firmware about how many points in can hold in memory, not an issue with the CSV file.
What board does that printer use?

Mads794

@jay_s_uk to me it looks like a DueX5 with a Duet 2 board

jay_s_uk

@Mads794 that board is pretty much at max flash and ram on the MCU so definitely won't be getting the new G29 S4 feature and won't be able to handle any more probe points.
It may be worth exploring probing just the print area before you print

Mads794

@jay_s_uk Thats a very interesting suggestion, basically limiting it to the print area though the configuration file and run for example 21x21 in just that specific area and a little bit more for allow for the edges have some wiggle room?

jay_s_uk

@Mads794 yes, basically.
This may be a good thread to start https://forum.duet3d.com/topic/30796/only-probe-where-the-part-will-be-printed

Mads794

@jay_s_uk legend!

Mads794

@jay_s_uk Speaking of the board being pretty much at max capacity, would it be beneficial to potentially be looking into a card that would have this capability?

jay_s_uk

@Mads794 currently, the Duet 3 6HC and duet 3 mini 5+ are also limited to 21x21 probe points. There may or may not be plans to increase the number of probe points for those boards but thats something @Phaedrux or @droftarts may be able to answer.
In terms of upgrading, the duet 3 mini uses almost the same connectors as the duet 2 and wouldn't require any recrimping to swap, but it only natively supports up to 7 drivers. If you need more than that then you would have to look at the Duet 3 6HC + another 6HC or 3HC, which would require recrimping of the motor connections.

Phaedrux

If I can get a flat first layer out of a Modix Big Meter with 21x21 you should be able to get one with the 180x.

Bed assembly is critical to start as flat as possible and minimize warping.

And a thicker fatter first layer can go a long way.

The trick to probe only he printed area can make a big difference as well.

I don't know if or when an increase to the limit would be coming. If it did, it would probably only make it to Duet 3 boards due to the memory limitations.