Notifications
Clear all

Z-axis Recalibration Question  

  RSS
John3
(@john3)
Active Member
Z-axis Recalibration Question

Firstly, my PRUSA mk3s+ is the most amazing machine I've ever owned!  My entire family is completely absorbed and fascinated by it.  I've had only 1 issue and it was my fault for not following directions during set-up and I figured it out by simply repeating a few steps of the assembly (Y-axis length error for the record).

My Question:  I discovered that my prints are better by rolling z-axis down by 10% to 90% and this remains consistent on all of my prints.  How much should I change z during a recalibration to align with this change so I don't have to do this every print?  The calibration process measures differently (i.e. 0.001 etc.) , hence my question.  Is it the obvious 0.1?

Posted : 17/11/2021 4:00 pm
Dan Rogers
(@dan-rogers)
Noble Member
Not the right terms ... hard to guess what you are after.

What does "rolling down the Z" mean?  Are you referring to live Z adjustments?  Those should be done during the first layer on any print or you can use the built in Z calibration routine.  Adjusting Z during the first layer will be preserved (unless you delete it).

To do the Z adjustment, during any first layer, click the wheel, and scroll down to "adjust live Z".  Click that.  Then you can adjust Z setting by turning the wheel.  Counter clockwise gets the nozzle closer to the bed (each number is a micron - a very small measurement thinner than a gnat fart).  So turn a lot to make a difference - .10 at a time is a good pace.  What you are trying to do is get the squish right - not too low, and not too high.

Posted : 17/11/2021 5:03 pm
John3
(@john3)
Active Member
Topic starter answered:
RE: Z-axis Recalibration Question

Thanks Dan.  Yes, I am referring to the Live adjustment ("10%").  My printer has not been retaining that setting however until my current print.  I just attempted a Benchy that came loose so I cancelled it and then started a new one.  It is the first time the Live adjustment has been retained.

If it continues to retain it my worries are over.  If not, my preference would be to manipulate my Z calibration routine to match this 10% live Z adjustment and it is not clear to me what the relationship between the two measuring methods are.  

Posted : 17/11/2021 5:20 pm
fuchsr
(@fuchsr)
Noble Member
RE: Z-axis Recalibration Question

Still not sure I understand what you mean by

rolling z-axis down by 10% to 90%

and

manipulate my Z calibration routine to match this 10% live Z adjustment

As Dan said, the process is pretty straightforward. Use the inbuilt process for first layer calibration or the live z my way method https://forum.prusaprinters.org/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/life-adjust-z-my-way/ to find a Live Z value that gives you a nice calibration square. That value will be retained by the printer, across prints as well as shutdowns. I don't know what other method you're referring to with "two measuring methods".

Posted : 17/11/2021 5:40 pm
John3
(@john3)
Active Member
Topic starter answered:
RE: Z-axis Recalibration Question

That's what I needed!  Thank you both.  Apologies for my lack of correct terminology.  I've had my printer now for exactly one week and it has only been printing for 3-days so I'm a total rookie.  I was under the impression I could completely tune from the  "v2 calibration gcode" and not have to apply a Live Z correction at all.  I get it now.

Posted by: @fuchsr

Still not sure I understand what you mean by

rolling z-axis down by 10% to 90%

and

manipulate my Z calibration routine to match this 10% live Z adjustment

As Dan said, the process is pretty straightforward. Use the inbuilt process for first layer calibration or the live z my way method https://forum.prusaprinters.org/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/life-adjust-z-my-way/ to find a Live Z value that gives you a nice calibration square. That value will be retained by the printer, across prints as well as shutdowns. I don't know what other method you're referring to with "two measuring methods".

 

Posted : 17/11/2021 7:01 pm
Share: