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Live Z Adjust Constantly Decreasing  

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acorona
(@acorona)
New Member
Re: Live Z Adjust Constantly Decreasing

+1

I've the same problem, it started with -0.500 an now it's at -0.900, I print only ABS.

Respondido : 10/07/2017 6:34 pm
volker.l
(@volker-l)
New Member
Re: Live Z Adjust Constantly Decreasing

+1
The printer worked (not at all to my satisfaction, though) for PLA and PETG. Since I switched to ABS, I have exactly the same problem. Basically, it never sticks, since the height is way too high after starting with the print, even though I did the live Z adjustment very precisely.

Assume it is connected to the higher temperature for ABS.

I consider this a serious flaw, and apparently Prusa does not care, given the time these complaints are out.

I just hope people interested in buying a 3d printer read this before taking a decision.

Respondido : 26/07/2017 3:37 pm
Foppemoa
(@foppemoa)
Active Member
Re: Live Z Adjust Constantly Decreasing

I've noticed this same problem with my printer now (got it last week, and it's running the latest firmware).

First thought it was because I started printing more with PETG after first dialing it in with PLA.
But I basically have to live adjust Z for every new print.

Respondido : 31/07/2017 9:54 am
JeffJordan
(@jeffjordan)
Miembro Moderator
Re: Live Z Adjust Constantly Decreasing

did you enable the temperature calibration, or is it disabled (my recommendation) ?

dem inscheniör is' nix zu schwör...

Respondido : 31/07/2017 10:42 am
Robert Bonham
(@robert-bonham)
Estimable Member
Re: Live Z Adjust Constantly Decreasing

I run my MK2S in my garage where the temperature varies by 30 degrees day to day. I was constantly chasing a good live-Z #.

I used this gadget to adjust my pinda height (mostly just so I have a consistent height when I change nozzles, but I also got my 'best' live-Z using it (-.165)

I ran the temp calibration and turned temp calibration: ON.

I put my z-axis at 100mm+ while the printer warms up, then it does it's 2 minute pinda warm up before each print and I was able to stop messing with my live-Z.

admittedly, it's also summer now, so my garage is always warmer (70f+), the gadget itself may have put my pinda at a more accurate height. The temp calibration may not be needed, but I do believe the raised z-axis while warming is. I was mostly tired of bad first layers and did a little bit of everything at once, and it worked. 😀

Robert B.

Respondido : 31/07/2017 7:24 pm
Lee
 Lee
(@lee-8)
New Member
Re: Live Z Adjust Constantly Decreasing


I run my MK2S in my garage where the temperature varies by 30 degrees day to day. I was constantly chasing a good live-Z #.

I used this gadget to adjust my pinda height (mostly just so I have a consistent height when I change nozzles, but I also got my 'best' live-Z using it (-.165)

I ran the temp calibration and turned temp calibration: ON.

I put my z-axis at 100mm+ while the printer warms up, then it does it's 2 minute pinda warm up before each print and I was able to stop messing with my live-Z.

admittedly, it's also summer now, so my garage is always warmer (70f+), the gadget itself may have put my pinda at a more accurate height. The temp calibration may not be needed, but I do believe the raised z-axis while warming is. I was mostly tired of bad first layers and did a little bit of everything at once, and it worked. 😀

What gadget are you using? I see no image or link to gadget?

Respondido : 11/08/2017 5:11 pm
Robert Bonham
(@robert-bonham)
Estimable Member
Re: Live Z Adjust Constantly Decreasing



What gadget are you using? I see no image or link to gadget?

Sorry about that https://www.thingiverse.com/thing:1977997

Robert B.

Respondido : 14/08/2017 6:47 pm
2chengzzz
(@2chengzzz)
Active Member
Re: Live Z Adjust Constantly Decreasing

Why couldn't we just auto level BEFORE heating the bed? OR even better, have a preset bed temp before auto levelling, then after set the real bed temp. This will account for ambient temperature.

Respondido : 02/09/2017 1:55 am
AJS
 AJS
(@ajs)
Noble Member
Re: Live Z Adjust Constantly Decreasing


Why couldn't we just auto level BEFORE heating the bed? OR even better, have a preset bed temp before auto levelling, then after set the real bed temp. This will account for ambient temperature.

http://shop.prusa3d.com/forum/improvements-f14/begin-print-cycle-time-reduction-calibrate-while-h-t5673.html

Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage or loss. If you solve your problem, please post the solution…

Respondido : 02/09/2017 4:10 am
joachim.k2
(@joachim-k2)
New Member
Re: Live Z Adjust Constantly Decreasing

HI

i have my prusa now for 2 weeks and i can't get a good print to start.
when i start up the printer i need te change the live z all the time .

when i start i need to change it to 250 .
if the printer does a second print it needs to be changed to 170 to get a good layer .

it's really frustrating,

is there a fix to it ?

Respondido : 03/09/2017 11:39 am
AJS
 AJS
(@ajs)
Noble Member
Re: Live Z Adjust Constantly Decreasing


HI

i have my prusa now for 2 weeks and i can't get a good print to start.
when i start up the printer i need te change the live z all the time .

when i start i need to change it to 250 .
if the printer does a second print it needs to be changed to 170 to get a good layer .

it's really frustrating,

is there a fix to it ?

This seems to be a problem that is dependent on your PINDA probe. The fixes that people like are to make sure they warm up the printer with Z at 100mm to keep the PINDA probe temp stable. (Warming up while Z is down seems to exacerbate the problem.) To handle this, people have modified their Start GCODE in the slicer to something like this:

M115 U3.0.12 ; tell printer latest fw version
M83 ; extruder relative mode
M104 S170; Extruder to 170
M140 S[first_layer_bed_temperature] ; set bed temp
G28 W ; home all without mesh bed level
G1 X0 Y0 Z125; home X axis Lift to 125
M190 S[first_layer_bed_temperature] ; wait for bed temp
M109 S170 ; wait for extruder temp to hit 170
M104 S[first_layer_temperature] ; set extruder temp
G80 ; mesh bed leveling while rising in temp
G1 Y-3.0 F1000.0 ; go outside printing area
M109 S[first_layer_temperature] ; wait for extruder temp if needed
G92 E0 ; reset extrusion distance
G1 X100.0 E9.0 F1000.0 ; intro line
G1 X200.0 E12.5 F1000.0 ; intro line

Which also does the calibration at a lower extruder temperature to help fight oozing.

Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage or loss. If you solve your problem, please post the solution…

Respondido : 03/09/2017 4:52 pm
SubSite
(@subsite)
New Member
Re: Live Z Adjust Constantly Decreasing

Wow, why isn't this included in the Prusa printing handbook? The official Pruca Slic3r settings should also have the Z lift commands in the G-code.

Everything has worked flawlessly until I started a tricky PETG project. Had to abort the first print after a few layers, and the piece i scraped off had a super nice and smooth underside. I immediately started the next print, but now the first layer failed miserably. I started to do lots of test prints, and got random results. I couldn't figure out what the problem was, I started to suspect some nuts in the printer frame had come loose, but couldn't find any problems. I pulled my hair an printed failed test models all night until I finally found this thread at 02:30 in the morning.

Now I let the printer cool down completely before each print, and then do the warmup with Z high up. The first layer is beautiful again! I've added the Z-lift G-code to Slic3r, will see how that works out.

This problem is also mentioned on Prusas github, scroll down to "Temperature Calibration": https://github.com/prusa3d/Prusa-Firmware/releases/tag/v3.0.11-RC1

Respondido : 20/10/2017 9:13 am
ryman08
(@ryman08)
New Member
Re: Live Z Adjust Constantly Decreasing

I was having the same issue today where I would constantly have to adjust the z level adjust -600 (-600, -1200, -1800, etc) every print and found this topic on reddit. https://www.reddit.com/r/3Dprinting/comments/5a62o1/prusa_i3_mk2_need_to_live_z_adjust_05_mm_every/

Once I modified the z level adjust while printing the V2Calibration from prusa, the z level adjust stuck.

Respondido : 29/10/2017 3:24 am
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