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Nozzle runs into print

Posted by adenton 
Nozzle runs into print
June 23, 2017 07:29PM

The current issue that I am working with my printer is getting the nozzle to not run into the print while it is printing. I have read a few other threads about this same topic and none of their suggestions have been a solution to this issue for me. Essentially, the nozzle is just too low.

Here is what I have tried:
1. re-calibrating the z-axis
2. Changed the 3rd parameter of _MAX_FEEDRATE from to 2
3. Changed the 3rd parameter of _MAX_ACCELERATION_UNITS_PER_SQ_SECOND to 10
4. In Sli3er I have changed to Lift Z from 0 to 0.5
5. Also in Sli3er I changed the extrusion multiplier, however, I wasn't seeing a difference so I just kept lowering. Currently at 0.5 which seems crazy low but there wasn't much of difference when it was at 0.9 to begin with...

I'm not sure what else to try. The nozzle is so close to the print that it will often knock the print causing the whole thing to fail, or be so close the the filament won't come out smooth.

I can provide images, video, and other details if that helps.
Re: Nozzle runs into print
June 23, 2017 09:00PM
Have you calibrated the extruder?
If you went from .9 to .5 that should make a HUGE difference.
Re: Nozzle runs into print
June 23, 2017 09:10PM
Oooooohhhhh! That's what I was forgetting! Will attempt tomorrow and report back.
Re: Nozzle runs into print
June 24, 2017 11:57PM
Okay, I have re-calibrated my extruder @ (i.e. 10mm extrusion is actually 10mm of filament going in) and the prints look better, however the nozzle tip is still rubbing against the top of the printing object. The rubbing is audible, and at that point I just stop the print because the filament isn't able to come out well since the tip of the extrude is too close.

Any additional suggestions?
Re: Nozzle runs into print
June 26, 2017 09:12AM
Do you mean the 2nd layer is the issue?
What is your layer height, nozzle size, Z offset etc. ?
Re: Nozzle runs into print
June 29, 2017 05:12PM
Yes, well its more a a 3rd+ layer problem the second layer is acceptable.

Layer height: 0.3mm
First Layer height: 0.3mm
Nozzle diameter: 0.4mm
Z offset: 0mm
Re: Nozzle runs into print
June 30, 2017 07:06AM
Does fit with a poorly calibrated Z axis. If you request movement to z=100 do you get 100. Since you have zero in the Z offset (should be the distance between the bed and nozzle when homed [set during bed levelling]) usually about -0.15 for paper, your 1st layer is theoretically too large but if your z is calibrated low it will effectively counteract this until layer 2 or 3 when you are effectively over extruding. This may also explain while the multiplier is having less effect.
This assumes if you request 100mm you get a lower value.
Is Z missing steps (clicking), this can be due to insufficient current and could be due to a PSU issue. Calibrate the Z axis with the hot end on to ensure you have the same power drain as when printing.
Re: Nozzle runs into print
July 01, 2017 06:04PM
Thank you for the suggestions. Great idea to calibrate the the z-axis with the hotend on. That actually did change the distance displaced. It moved about an extra 8mm. So with that fixed, I managed to get the absolute best print I've ever done! Everything is fixed! For now...

Thank you!
Re: Nozzle runs into print
July 02, 2017 05:28AM
8 mm? Holy Moly... I think you wanna say 0.8mm, this is still alot.
Re: Nozzle runs into print
July 03, 2017 05:33PM
Nope, 8mm.... I know, yikes. My printer does some funky things.
Re: Nozzle runs into print
July 05, 2017 05:04AM
Wow. The difference from non heated bed & extruder to both heated at my Mendel is about 0.4 or 0.6mm. Anyway, you get good prints now, congrats!

Edited 1 time(s). Last edit at 07/05/2017 05:04AM by Inhumierer.
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