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JeffJordan
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life adjust Z - my way

Mon Jan 16, 2017 10:14 pm

hi community
just want to share with you my way of finding the right correction value for the life Z adjustment.
just in case that somebody still tries to get it right with the v2 calibration gcode that came with the kit, which i think is only of limited usability.

:idea:
find attached a little gcode that should print a 75x75mm surface with 0.2mm height (PLA settings).
i simply print this file in a bright color (takes about 12 minutes) and change the life Z adjustment level in the middle of the print, when the diagonal of the square is reached.
so a little film is printed. a good idea is to write the settings with an edding at the sheet ;) .
i repeat the procedure until i get a completely smooth and homogenous surface.
in addition it's a good idea to measure the thickness of the film with a micrometer gauge or a digital vernier calliper :!:

:arrow: when you look at the attached picture, you can see at first sight, that the right foil (with the -365um and -400um) shows some small gaps, which indicates that you need to squish down the nozzle a little bit more.
furthermore you can see that the -500um setting delivered the best result, and as you can guess: it's thickness was exactly 0.20mm.

anything more to explain ?

update:
just forget to tell you how you can get the film off from the heatbed without damaging it:
just use coolant spray at one edge. the sheet will immediately curl up and you can get it off easy as pie from the printing surface with your spatula.

edit 17th january: just replaced the attached gcode file with one where i added a "G1 Z=10.000 F1800" at the end, just to make sure that the nozzle moves up a little bit more (would remain at 0.2mm after the print).

edit 29th of august: removed the first test sheet (which has been downloaded more than 1000 times) and replaced it by the most recent one (v4).
calibration_surface_PLA_75x75@200um_v4.zip
(5.6 KiB) Downloaded 2583 times
20170116_223130.jpg
20170116_223130.jpg (1.73 MiB) Viewed 34760 times
.

:arrow: update (14.01.2018): calibration surfaces for PLA, ABS & PETG (generated with the latest S3D version, lin-advance, G87 and preheat procedure to avoid nozzle dripping (tnx 2 PJR)):
S3D_calibration_surfaces_75x75@200um_v6.1.zip
(17.82 KiB) Downloaded 1243 times
Last edited by JeffJordan on Tue Jan 17, 2017 6:57 pm, edited 2 times in total.
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stephan.k
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Re: life adjust Z - my way

Tue Jan 17, 2017 12:14 am

Jeff, could you add 2 more examples with the nozzle too close? I think that'd be really helpfull

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Re: life adjust Z - my way

Tue Jan 17, 2017 4:39 am

Thank you very much Jeff, this came at the perfect time for me. A second stephan.k, pics of too close would be helpful.

Also, what is coolant spray?

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Re: life adjust Z - my way

Tue Jan 17, 2017 6:44 pm

jordan.c wrote:Also what is coolant spray?
:idea:
cooling spray, or sometimes called ice spray. its used to cool down parts very quick, which is useful if you are searching defective components in electronics....
you can see the effect at the first picture attached here:
20170117_183700.jpg
20170117_183700.jpg (689.39 KiB) Viewed 34711 times
stephan.k wrote:Jeff, could you add 2 more examples with the nozzle too close? I think that'd be really helpfull
yes, here we go.
:arrow:
when the life adjust value is too high, the surface gets a little bit rough and dim. you can feel it very good when you fondle over it with your fingers.
at the edge with the -650 & -600 µm, you can even see some little crumbles, small blisters and very fine strings. i stopped here at -650 µm because i won't risk to damage my PEI sheet.
20170117_185847.jpg
20170117_185847.jpg (807.99 KiB) Viewed 34711 times
by the way, when you measure the thickness of the foil, it's not thinner than the one with -500 µm as one might expect !
quite contrary it rises up again to 0.23 mm.
from -365 to -450 µm life z adjustment the sheet had a thickness of 0.25 mm.
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marcus.a
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Re: life adjust Z - my way

Thu Jan 19, 2017 8:48 am

I tried to use your gcode.
But the nozzle temp is set to 0??

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JeffJordan
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Re: life adjust Z - my way

Thu Jan 19, 2017 1:29 pm

hi marcus,
be patient ;-).

i generated the gcode with simplify3d's default settings for printers. they first heat up the print surface and when the bed temperature is reached, the nozzle starts to heat.
i think that they want to avoid over current when both devices start to heat up the same time at full power (not nescessary at our i3/MK2, because the supply has enough power for both).

i'll have a look at it this evening (when i'm home from my office) and correct this behaviour.

update: use this gcode now, it'll start heating up the nozzle and the printbed at the same time.
calibration_surface_75x75@200um.zip
(5.71 KiB) Downloaded 875 times
Last edited by JeffJordan on Thu Jan 19, 2017 9:28 pm, edited 1 time in total.
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marcus.a
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Re: life adjust Z - my way

Thu Jan 19, 2017 1:41 pm

Cool, thx for the answer. I'm a newbie.
But I printed the whistle now perfect and my own part is running now smooth. Yeah :D

Thx

rod.j
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Re: life adjust Z - my way

Sat Jan 21, 2017 11:42 pm

Just wanted to say that your live z method with your calibration code worked very well for me. Thanks for your post.

mitch99
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Re: life adjust Z - my way

Sun Jan 22, 2017 2:11 am

thank you very much for this little tip and the g code, i´m also new and this is absolutely helpful, some optical printed reference points how it should look and how it shouldn´t.

so big thanks for that!

cheers

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Re: life adjust Z - my way

Sun Jan 22, 2017 10:34 am

thanks for the feedback !
nice to know that it's useful for others too.
:P
by the way: i added some M300's in the middle of the print, so your prusa gives you an acoustic signal when it's time to set the next life z adjustment value. just for your convenience.
calibration_surface_75x75@200um_v3.zip
(5.54 KiB) Downloaded 1089 times
;)
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