bed flat/even but bed mash shows different | Rat Rig Community [Unofficial] | Page 1

marble holly Mar 12, 2025, 4:35 PM

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Hi hope hope anyone can help menwit an idea what the reason could be . Ratrig 3.1 400 Ratos 2.1 with beacon . I installed a new images set all up calibrated the beacon bed mash around 0.3 ( see picture) after some testprints i played a bit around with the bed mashed and get from one mash to the next 1,2mm but in an angle from front to back . checked multiple times allwas around that result . i checked the distances nozzle bed in all corners and all the same the the shown bedmash is wrong . i recalibrated the beacon a few times allways the same result . tried a print one side in air one side nearly milled into the plate . i habe no idea anymore what else i can try only changes on the beacon i did was changing the offset to 30 ( also changes back no difference) and to invrease the ponts in xand y . I realy hope on someone with an idea
BR Thomas

wet pewterBOT Mar 12, 2025, 4:35 PM

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steep sinew Mar 12, 2025, 6:19 PM

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have you run z-tilt?

marble holly Mar 12, 2025, 6:30 PM

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every time , and for a try i also did without it no changes

steep sinew Mar 12, 2025, 6:31 PM

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I'f you've run z-tilt successfully then gotten a bed mesh at that angle, that is freakin WEIRD

marble holly Mar 12, 2025, 6:34 PM

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yep thats my trouble , it fully makes no sense , like i wrote i also took a 1 mm sheet metql and set the nozzle to 1mm than checked all corners all the nozzle is in a +-0.1mm range to z tilt is working the plat is even to the nozzle but the beacon is measure that wirred mash ,

steep sinew Mar 12, 2025, 6:35 PM

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When you try to print do you have problems with the first layer front to back?

marble holly Mar 12, 2025, 6:35 PM

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front in air back nearly milling into the plate

steep sinew Mar 12, 2025, 6:43 PM

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@dry elm You got any ideas? I've never heard of this and not finding anything on a few searches

dry elm Mar 12, 2025, 6:59 PM

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steep sinew <@403691292535816192> You got any ideas? I've never heard of this and not findin...

@marble holly can you upload your debug.zip?

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That second image definitely looks like a z-tilt issue

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is the cable pulling at the front and then as it moves toward the back the cable has more slack and thus the angle of the beacon is changing?

steep sinew Mar 12, 2025, 7:04 PM

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I wouldn't expect that to smoothly change the distance, feel like there would be a "step" in the reading once the cable went taut. and according Luchador's measuring with some sheet metal the z-tilt is working; the bed is trammed, it's just the mesh that is failing and in such a consistent way.

wheat ridge Mar 12, 2025, 8:45 PM

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steep sinew I wouldn't expect that to smoothly change the distance, feel like there would be...

Just tossing an idea, could be a step as the gantry moves further back that pulls slightly more on the beacon to cause this. Giving you a "smooth" transition as each -Y movement pulls on the beacon more

steep sinew Mar 12, 2025, 8:48 PM

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But again, how would the z-tilt be successful but not the bed mesh in that case?

wheat ridge Mar 12, 2025, 9:06 PM

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steep sinew But again, how would the z-tilt be successful but not the bed mesh in that case?

Doesn't V-tilt actually contact the build surface? while meshing uses the eddy-current?

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I guess I've never really paid all that much attention during either motion

steep sinew Mar 12, 2025, 9:11 PM

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Hm, I'm not sure. If that is true then the theorized tilting of the beacon could be the culprit. I thought contact was only for initial calibration but I could easily be wrong

marble holly Mar 12, 2025, 9:44 PM

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i can upload the zip and a video of making a mash tomorrow evening , today i cant get to the printer anymore

marble holly Mar 13, 2025, 6:57 PM

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Hi everyone , first thanks to all of you to thinking on my trouble. I just made some pictures and videos . than started also to measure the distance in the corners again to show you that they are the same. BUT today it was showing me a different result , today after the ztilt he show me around 1 mm difference front to back . ( i measured yesterday nozzle distance and distance of my still mounted pinda so i was super surprised to see a different result today) with that new result it was clear the ztilt was not working anymore . So i searched again marked the position of the beacon and finaly saw that the behind point was just behind the flexplate , and so of course the ztilt was not working anymore . i was wondering bec i printed 400x400 1 layer sheets for testing the last days until i remember i changed the endstop holder a week ago so i saw that the srew was still a bit turnable . I expect during testing the endstop move slowly more and more behind until he just meassure behind the plate. i playe a bit around and moved the endstop until it was working again with good result again. The only thing i totaly not get 2 measuring points and ways and showing me a good result I measuring a lot and regulary so that point is making me crazy just now

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does anyone know how i could move the z tilt possitions a bit more to the front ? than i could be save that that is not happening anymore

steep sinew Mar 13, 2025, 7:10 PM

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marble holly does anyone know how i could move the z tilt possitions a bit more to the front ...

it is done in the z_tllt section. This is off a 400 for example

[z_tilt]
z_positions:
    0,0
    200,400
    400,0
points:
    60,60
    235,370
    360,60

marble holly Mar 13, 2025, 7:20 PM

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thanks i searched a lot but could not find it will try to move it a bit to the front. my beacon is 32 mm behind the nozzle , max offset i can set is 30 so it looks like i was allways super close to the borders and not realised it

dry elm Mar 13, 2025, 7:30 PM

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you need to adjust your endstop until what the machine thinks is 0,0 is on the front left of the build plate. Otherwise you are just fighting with bad data.

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and by adjust the endstop, I mean adjusting the config to tell the machine how far away the endstop is from the correct front of the machine

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#v-core-4 message

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you can ignore that position_min needs to be the same as position_endstop in that post since you are vcore 3.1 (homes to the back) instead of vcore 4 (homes to the front)

marble holly Mar 13, 2025, 7:48 PM

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how you adjusting it in the config ?

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what i just additional did to change the trihorn now the beacon will be 2mm more close to the nozzle that should help me a bit too.

dry elm Mar 13, 2025, 7:52 PM

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marble holly how you adjusting it in the config ?

add it in the user overrides section in your printer.cfg

marble holly Mar 13, 2025, 7:56 PM

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not fully get you , so you mean meassuring the distance from endstop to the front end of my printbed and place that as 0 ? which code is changing that ?

dry elm Mar 13, 2025, 9:15 PM

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after homing, if you issue the command to move it to 0,0 - is the nozzle correctly on the corner of the build plate? If not as I suspect, you need to fix that before trying to adjust your z-tilt

#bed flat/even but bed mash shows different