https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/ Prusa3D Forum Discussion Board en-US Thu, 16 Apr 2026 01:46:53 +0000 wpForo 60 https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/paged/2/#post-41361 Mon, 11 Sep 2017 10:11:52 +0000 provided a detailed description and a special set of gcodes on how to dial in the hyperfine bed levelling.
it took a little bit longer than expected, because my first attempt with the gcodes didn't work as expected. but now it should be easy to understand and to use.

@walter: you can only go for max. +/-99 µm when using the altered firmware with the 8 correction values for the meshbed levelling through menu.
150 would be to much. but from the maths and the principle you are right.
if you need values between +/- 100 and 200, you've to use the G80 command and need to parse the values through the gcode to your printer, as proposed by PJR.]]> Prusa i3 kit (Archive) JeffJordan https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/paged/2/#post-41361 https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/paged/2/#post-41194 Fri, 08 Sep 2017 19:26:01 +0000 Thanks for the details

Just to make sure I understood the math behind this calibration:

Suppose I have set the "live Z adjustment value" at -350 in the bed center point.
I want now to adjust the "a" corner. My live Z adjustment for that corner is -500.
Am I right I need to enter -150 for "a" ? -500 -(-350)
When finished with the 8 points, I will set back -350 for my live Z adjustment value.

Hope that makes sense!
Thanks]]> Prusa i3 kit (Archive) walter.v4 https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/paged/2/#post-41194 https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/paged/2/#post-41168 Fri, 08 Sep 2017 08:29:36 +0000 ps. I'm going to make a proposal on how to dial in the values at the hyperfine meshbed levelling thread later on... I'd still be interested in your process, will you post it here or in another thread? I will post it at the hyperfine bed levelling thread, as soon as I've tested it here at my printers personally.
I've already prepared a set of tweaked gcodes, with a tiny test patch for every calibration point.

here in advance my idea on how to determine the required correction levels most efficient:

the idea is to dial in the center first with the live z adjustment. then note down the value and proceed with printing single patches for every edge/corner without starting another meshbed levelling (G80), without disabling the steppers and without cooling down the hotend completely (bed remains heated as well).
then dialing in the correct z-height with the live z adjustment again for each corner/edge patch and writing down the determined value for the corresponding spot.
so you'll get 9 "live z adjustment values" in total. subtract the value of the center adjustment level from the remaining 8 and you'll get the 8 correction values to dial in for the 8 meshbed correction points.
and: don't forget the set the live z adjustment level back to the value you've determined for the center spot.
:roll:]]> Prusa i3 kit (Archive) JeffJordan https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/paged/2/#post-41168 https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/paged/2/#post-41138 Thu, 07 Sep 2017 22:05:53 +0000 ps. I'm going to make a proposal on how to dial in the values at the hyperfine meshbed levelling thread later on... I'd still be interested in your process, will you post it here or in another thread?]]> Prusa i3 kit (Archive) shaun.k2 https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/paged/2/#post-41138 https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/paged/2/#post-40962 Tue, 05 Sep 2017 15:26:49 +0000 ...
Should I be worried that the bumper on one of the Z axes is higher than the other? Is this an assembly fault and something I should fix before I go any further? not essentially necessary, because the meshbed levelling should correct the slight skew of the axis, but it would make things easier to dial in the 8 values for the hyperfine bed correction.

ps. I'm going to make a proposal on how to dial in the values at the hyperfine meshbed levelling thread later on...]]> Prusa i3 kit (Archive) JeffJordan https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/paged/2/#post-40962 https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/paged/2/#post-40931 Tue, 05 Sep 2017 04:00:56 +0000 Okay so still no luck printing, seems like the moment the printer heats up, all the Live-Z values go out of whack. So I went back to Calibrate XYZ and started again. This time I measured the live-Z values at which the paper stops resisting for each of the 9 points around the bed.... but you still know that the meshbed levelling only works during a print, not when you move the extruder through the menu (either through the axis menu or the live z adjustment level) ?

so what you've "measured" with your values is only of limited usage... and only gives you the information, that your right "bumper" at the top of the z-axis is slightly lower than the left one.... so "calibrate z" delivers a slightly askew x-axis. I had thought measuring these 9 values gives a good basis for a ballpark estimation of the hyperfine bed correction values. I should add that I flashed the hyperfine firmware, set a live Z of - 0.500mm to get the centre printing fine, and managed to get the rear left corner dialed in, but when it got to the middle left square (the one with - 770), the nozzle was printing into thin air even at +99 bed correction. So I might try to adjust the PINDA slightly to not get such a low value for that point on the bed.

Should I be worried that the bumper on one of the Z axes is higher than the other? Is this an assembly fault and something I should fix before I go any further?]]> Prusa i3 kit (Archive) shaun.k2 https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/paged/2/#post-40931 https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/#post-40921 Tue, 05 Sep 2017 00:16:14 +0000 Okay so still no luck printing, seems like the moment the printer heats up, all the Live-Z values go out of whack. So I went back to Calibrate XYZ and started again. This time I measured the live-Z values at which the paper stops resisting for each of the 9 points around the bed.... but you still know that the meshbed levelling only works during a print, not when you move the extruder through the menu (either through the axis menu or the live z adjustment level) ?

so what you've "measured" with your values is only of limited usage... and only gives you the information, that your right "bumper" at the top of the z-axis is slightly lower than the left one.... so "calibrate z" delivers a slightly askew x-axis.]]> Prusa i3 kit (Archive) JeffJordan https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/#post-40921 https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/#post-40919 Tue, 05 Sep 2017 00:02:02 +0000 http://shop.prusa3d.com/forum/prusa-i3-kit-building-calibrating-first-print-main-f6/life-adjust-z-my-way-t2981.html has a good description of getting your z-height set more accurately. It also has some pictures of first layer issues that look a lot like your picture.]]> Prusa i3 kit (Archive) Build Stuff With Bob https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/#post-40919 https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/#post-40905 Mon, 04 Sep 2017 22:16:41 +0000 If you place a ruler across the bed, does the bed seem flat or bowed? Check in both X and Y and at different places (edges, middle).

If the bed if flat-ish then you could try putting a washer under the two right corners to bring those values up.

If it is this bowed, then trying the hyperfine bed level might be your best bet.

Since once corner is slow low, you may want to move the PINDA up a smidge.]]> Prusa i3 kit (Archive) AJS https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/#post-40905 https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/#post-40899 Mon, 04 Sep 2017 20:26:20 +0000


All measurements are in microns and the rear right spot is marked with an 'X" because the nozzle was already so close or touching the bed (even at Live-Z = 0.000mm) that I couldn't fit the paper under it. This seems highly unusual..any idea why this happens? Calibration Z passes perfectly, and the PINDA probe centres itself in both circles more accurately than ever.

I feel like now is the time to try to hyperfine bed adjustment firmware..]]> Prusa i3 kit (Archive) shaun.k2 https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-prusa-i3-kit-archive/first-layer-issues-2-3-4-5/#post-40899