Verifying mesh levelling

[BStump]

@phaedrux said in Verifying mesh levelling:

@bstump Your max Z speed is set to 200. You could probably probe at that speed reliably especially if you're double probing each point. You already have a dwell time between probe moves to allow it to settle.

The dive height just needs to be high enough for the pin to reliably drop and the z axis reach steady motion before it triggers.

Your trigger height is 1.0mm which seems too perfect. Have you actually measured it?

https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe#Section_Calibrate_the_Z_probe_trigger_height

I do not know if the guys have verified the trigger height or not.

[fcwilt]

@bstump said in Verifying mesh levelling:

@phaedrux
Yes, anything to improve the time is probing would be good. take near 45 mins now to do 400 points

There is little to do to drastically improve the time.

The biggest "timesaver" would find a way to create and install a bed so flat that mesh compensation isn't needed.

If you solve that problem let me know - I could use a totally flat bed.

Frederick

[Phaedrux]

@fcwilt said in Verifying mesh levelling:

I could use a totally flat bed.

I'm still waiting for someone to try the self leveling concrete bed. At 1 sq meter it might be practical... just saying.

[BStump]

@phaedrux said in Verifying mesh levelling:

@fcwilt said in Verifying mesh levelling:

I could use a totally flat bed.

I'm still waiting for someone to try the self leveling concrete bed. At 1 sq meter it might be practical... just saying.

That would be a bitch to heat up and nasty with regards to spalling.

[dc42]

@fcwilt said in Verifying mesh levelling:

@bstump said in Verifying mesh levelling:

@phaedrux
Yes, anything to improve the time is probing would be good. take near 45 mins now to do 400 points

There is little to do to drastically improve the time.

The biggest "timesaver" would find a way to create and install a bed so flat that mesh compensation isn't needed.

If you solve that problem let me know - I could use a totally flat bed.

Frederick

You would also need a gantry with negligible sag, which is also not easy when spanning 1m.

[fcwilt]

@dc42 said in Verifying mesh levelling:

You would also need a gantry with negligible sag, which is also not easy when spanning 1m.

Indeed - I would never tackle trying to build such a large printer - I have trouble getting a satisfactorily flat bed on a 300x300 printer.

Wish I had a nice large mill but mine is too small to handle 300x300.

Sigh.

Frederick

[Phaedrux]

According to the config file it's a Modix Big Meter.

https://www.modix3d.com/tech-spec/

Should be fairly sturdy.

[BStump]

@fcwilt said in Verifying mesh levelling:

@dc42 said in Verifying mesh levelling:

You would also need a gantry with negligible sag, which is also not easy when spanning 1m.

Indeed - I would never tackle trying to build such a large printer - I have trouble getting a satisfactorily flat bed on a 300x300 printer.

Wish I had a nice large mill but mine is too small to handle 300x300.

Sigh.

Frederick

The bed of the Modix is made from this

https://www.howardprecision.com/aluminum/aluminum-cast-tool-jig-plate-stock-list/mic-6-aluminum/

Sadly Modix only provides grub leveling screws on the underside middle supports and not the perimeter ones. We may have to add them to the perimeter.

[fcwilt]

@bstump

Adjusting that many grub screws is not going to be any fun at all.

I have just four and even that is tedious.

Frederick

[Phaedrux]

@bstump said in Verifying mesh levelling:

Sadly Modix only provides grub leveling screws on the underside middle supports and not the perimeter ones. We may have to add them to the perimeter.

Given the weight of the bed the grub screws on the center area may be just to counteract sag, so the perimeter may be less critical.