Notifications
Clear all

First Layer Callibration Not Going My Way  

  RSS
maxwell.s2
(@maxwell-s2)
Active Member
First Layer Callibration Not Going My Way

Hey all,

Just some background, just got my printer assembled yesterday (MK3). Pretty much passed all self-test calibrations without trouble (one thing wasn't screwed in all the way for the Y-Axis test. Screwed it in and it was fixed in under 10 minutes). I get to the first-layer calibration part, and at first, nothing is coming out of the nozzle. I thought maybe I didn't push it in enough. I ran through the test several times, a few times it came out very little, didn't stick and then other times it stopped coming out completely. I took part of the extruder apart, as I got suggestions on looking at the idler and the bondtech pulley from somewhere else. Made adjustments there and then also realized that the screws, where springs are wrapped around them, were not tightened all the way for some reason. I fixed those and then the printer still didn't seem to be extruding, but I realize those spring screws happened to be coming out the side again. I fixed this one more time, and now it looks like extrusion is coming out with no trouble and the screws have stayed in fine.

Now, I'm running the first layer calibration test again and now the extrusion is coming out in a thin line, but, it's not sticking to the sheet and when the printer changes directions, it drags the previous line with it, makes a new line and then the same thing happens (I have a picture of this at the bottom). I think the Z-axis is involved in this, from research, but I'm a bit confused on how to resolve this. I've found that thread that talks about "life adjust Z - my way" and downloaded the file and put it on the SD card, but, of course, since it's not sticking, it just creates an outline that looks vaguely like a square and then proceeds to create a mess. The Z-Axis calibration during the first layer calibration seemed to result in the pla sticking (very slightly) better once I moved it below -1.000.

What do I need to do here? It feels like I'm so close!

Posted : 27/12/2018 7:57 am
RH_Dreambox
(@rh_dreambox)
Prominent Member
Re: First Layer Callibration Not Going My Way

There are hundreds of posts on the forum with this problem, and the answers are always the same:
1) Clean the bed with detergent and water
2) Lower the Z level because the nozzle is too high.

In your case, I would start by lowering the Z level a bit.

Bear MK3 with Bondtech extruder

Posted : 27/12/2018 9:40 am
maxwell.s2
(@maxwell-s2)
Active Member
Topic starter answered:
Re: First Layer Callibration Not Going My Way

I clean it with isopropyl. There's only a little debris there because I ran the test 3 times in a row, trying to get it to work, after cleaning it. And how would I know when the Z-level is right? I get to the Z-Level calibration in the first layer calibration and it doesn't seem to work wherever I put it (book says to not go below -2.000). It seems to do a straight line, but as soon as it turns a corner, I'm out of Mr.Roger's neighborhood and I'm getting robbed.

Posted : 27/12/2018 12:34 pm
xhillb61
(@xhillb61)
Trusted Member
Re: First Layer Callibration Not Going My Way

If you have to go under -2000 your Pinda is probably too high. Lower the pinda.
1layer is good, when you don´t feel spikes or wasves touching the sourface.

Cheers

Posted : 27/12/2018 4:16 pm
RH_Dreambox
(@rh_dreambox)
Prominent Member
Re: First Layer Callibration Not Going My Way

99% Isopropyl does not always do the "job".
You can use it between the prints and after that the bed is properly cleaned with detergent and water.
With a good height-adjusted PINDA, your Z level should be around -600 to -800.

Bear MK3 with Bondtech extruder

Posted : 27/12/2018 5:43 pm
maxwell.s2
(@maxwell-s2)
Active Member
Topic starter answered:
Re: First Layer Callibration Not Going My Way

Hey guys,

Turned out the probe was too high, but that didn't matter as much as it should have because I was experiencing bugs in the firmware (the first layer test wouldn't work even when the probe was adjusted properly). I reverted to a different firmware and, for the first time, filament started to stick. Now, just gotta resolve an issue with placement of the orange part underneath the fan (it drags into the print) and I should be good to go. Thanks for the suggestions. Live Z-Adjust got me a good value around -800.

Posted : 28/12/2018 8:34 am
Knickohr
(@knickohr)
Member Moderator
Re: First Layer Callibration Not Going My Way

Sorry, only in German, but brand-new and sometimes the solution for all layer one glueing problems :

https://shop.prusa3d.com/forum/zusammenbau-und-fehlersuche-bei-den-ersten-druckve-f273/wiki-howto-live-z-die-last-mit-dem-first-layer-fir-t26806.html

Thomas

Posted : 28/12/2018 10:16 am
randolph.l
(@randolph-l)
Honorable Member
Re: First Layer Callibration Not Going My Way

I have been fiddling (using Joan's concentric fill full sheet obtained from Bob's blog http://projects.ttlexceeded.com/3dprinting_live_z_calibration.html )
with the edge calibration in the firmware this is with the centre 75 x 75 mm as close as I can get it and with -25 microns Bed level correction applied to the right side. the other 3 bed level numbers are still at zero
if I go to -35 microns on the right side the top right corner gets too squished.
Thoughts?

Posted : 28/12/2018 5:16 pm
Tinkerwest
(@tinkerwest)
Trusted Member
Re: First Layer Callibration Not Going My Way


I have been fiddling (using Joan's concentric fill full sheet obtained from Bob's blog http://projects.ttlexceeded.com/3dprinting_live_z_calibration.html )
with the edge calibration in the firmware this is with the centre 75 x 75 mm as close as I can get it and with -25 microns Bed level correction applied to the right side. the other 3 bed level numbers are still at zero
if I go to -35 microns on the right side the top right corner gets too squished.
Thoughts?
IMG_0427.jpeg

There is some interesting work going on on github a true 7x7 Calibration, you might want try. It will slow down the start a little because it measures all 7x7 points but if it get a good first layer it will save time in the long run.

I have not tried it yet, but planning to try it this weekend.

https://github.com/prusa3d/Prusa-Firmware/issues/1239

Posted : 28/12/2018 6:45 pm
randolph.l
(@randolph-l)
Honorable Member
Re: First Layer Callibration Not Going My Way

Thank you John I will read it over and see if understand it... my luck with github stuff has been less than stellar so far I guess I should turn in my :geek: lycence 😳

Posted : 28/12/2018 10:35 pm
Share: