Notifications
Clear all

POLL - What is YOUR - Z axis offset for Prusa Mini?  

  RSS
aussieinkguy
(@aussieinkguy)
Active Member
POLL - What is YOUR - Z axis offset for Prusa Mini?

Hi All,

 

As it's so critical to the success of the print, I'm keen to get a idea of what Z-axis offsets Mini / Mini+ users are running: 

 

Mine is currently : -1.300.    (for PLA / PLA+ predominantly).

 

NB. If you use multiple settings, perhaps the one that gets the most use AND what filament it's for.

 

Keen for your feedback.

Prusa Mini+ - Fw. 2.3.1 - PrusaSlicer 2.3.0 (Mac) - Filaments PLA / PLA+ / PETG....
Posted : 07/03/2021 1:21 pm
Oxygen
(@oxygen)
Reputable Member
RE: POLL - What is YOUR - Z axis offset for Prusa Mini?

it all depends on the sensor (PINDA or SPINDA) and the print surface and how you calibrated the sensor

Mini with FW:4.3.1 + SuperPINDA + Bondtech Heatbreak + PC4-M8 couplers + 1 piece boden...
Posted : 09/03/2021 9:06 am
aussieinkguy
(@aussieinkguy)
Active Member
Topic starter answered:
RE: POLL - What is YOUR - Z axis offset for Prusa Mini?

@oxygen

OK, So i've gone back to the User Manual and calibrating the sensor wasn't one of the steps listed. Working from Section 6 (page 14) 'Your first print'. 

Is there something i've missed here?? 

Please advise how critical it is for this to be done on a new Prusa Mini+? And if there's a reference directing this. 

I found this in the help section : 

https://help.prusa3d.com/en/guide/how-to-adjust-the-height-of-the-m-i-n-d-a-sensor-mini_154547

If it's something that will improve the quality / printability of the printer. Then I'll work through this too. 

Thanks. 

PS. 'Bondtech Heatbreak' in your signature, was this an upgrade or a requirement. (Ie. was the printer working well prior to this install). Thanks. 

Prusa Mini+ - Fw. 2.3.1 - PrusaSlicer 2.3.0 (Mac) - Filaments PLA / PLA+ / PETG....
Posted : 09/03/2021 10:18 am
cwbullet
(@cwbullet)
Illustrious Member
RE: POLL - What is YOUR - Z axis offset for Prusa Mini?

-0.505 to -1.470

--------------------
Chuck H
3D Printer Review Blog...
Posted : 09/03/2021 11:21 am
Oxygen
(@oxygen)
Reputable Member
RE: POLL - What is YOUR - Z axis offset for Prusa Mini?

With calibrating the sensor I mean adjusting the height (visible in step 3 of the guide you pointing to) only I had issues with 0.8mm (the size of a credit card) my liveZ was -1850 and with a textured sheet you have to lower the Z by approx 200. LiveZ has a maximum value of -2000. I calibrated the SPINDA with 1.5mm and my Z varies now between -415 and -615. My choice to replace the heatbreak was done before I had the SPINDA sensor. In that period of time I had issues with under-extrusion (it could be that the issues were tied to the PINDA and if I would replace the heatbreak back my issues would still be solved...) same with the couplers and the boden tube -- my printer prints fine now.

Mini with FW:4.3.1 + SuperPINDA + Bondtech Heatbreak + PC4-M8 couplers + 1 piece boden...
Posted : 09/03/2021 12:12 pm
Richard D
(@richard-d)
Eminent Member
RE: POLL - What is YOUR - Z axis offset for Prusa Mini?

-0.995.

After adjusting the position of the heatbreak (it was too low, extending too far out of the heatsink as delivered from the factory) and the SPINDA to match.

Posted : 14/03/2021 1:55 am
Lung
 Lung
(@lung)
Eminent Member
RE: POLL - What is YOUR - Z axis offset for Prusa Mini?

-1615 on the smooth sheet, -1920 on the textured.

Posted : 15/03/2021 4:31 pm
Eric
 Eric
(@eric-3)
Active Member
RE: POLL - What is YOUR - Z axis offset for Prusa Mini?

-1.965  on the smooth sheet w/ PLA

Posted : 24/03/2021 6:55 am
Richard D
(@richard-d)
Eminent Member
RE: POLL - What is YOUR - Z axis offset for Prusa Mini?

After taking my hot end apart, mine's now recalibrated to -1.310 on the smooth sheet.

I can’t help thinking that numbers much higher than -1.500 suggest that either the SPINDA needs moving up a little, or more significantly that the heatbreak might need moving too,  With a poorly positioned heatbreak implicated in partial clogs and underextrusions.

Posted : 24/03/2021 7:19 am
Jaycm07
(@jaycm07)
New Member
POLL - What is YOUR - Z axis offset for Prusa Mini?

-2.000 and first layer is perfect. But, looking at the replies from others I may need to raise the heatbreak or SPINDA, which I probably wont do unless I start to have issues.

Posted : 31/07/2021 12:31 pm
BogdanH
(@bogdanh)
Reputable Member

As mentioned in previous posts (and elsewhere), there's no "right" Z-offset value, because it entirely depends on SuperPINDA position. That is, depending on SuperPINDA height, one can get good results (first layer) with -0.2 Z-offset, while someone else is happy printing at -1,900.
If you're happy with your first layer, just keep as it is. However, it's good to know, that -2.000 is max negative value and so you won't be able to decrease it anymore if needed.

Mini+ with Bondtech upgrade & modified firmware...
Posted : 31/07/2021 12:55 pm
cwbullet
(@cwbullet)
Illustrious Member
offset

Mine is now -1.450

--------------------
Chuck H
3D Printer Review Blog...
Posted : 31/07/2021 10:05 pm
AndrewTerry
(@andrewterry)
Eminent Member
If you put a space in the title, you don’t have to type a title

Mine is -0.908 for PLA/smooth sheet, and -1.3 for PETG/textured sheet.

Posted : 01/08/2021 8:26 am
Revy2k
(@revy2k)
New Member

After following the manual on how to set the initial height of the SPINDA, and performing 1st layer calibrations on the smooth PEI sheet with the included Prusament PLA samples I arrived at -1.315

When moved onto a 1kg spool of Prusament PLA, which was purchased along with the printer, I had to dial it back to 1.200

Take a zip tie from the package and place it under the SuperPINDA sensor. Use the middle part of the zip tie, not the tip.

Prusa MINI+ Kit (fw 4_3_1)...
Posted : 02/08/2021 10:43 pm
Jaycm07
(@jaycm07)
New Member

Was previously -2.00 for smooth sheet. Switched to textured sheet for PTEG and -2.00 was too high. Had to move SuperPINDA up some. Now sits at -.350 for smooth and -.750 for textured.

Posted : 12/09/2021 7:42 pm
JMH714
(@jmh714)
Estimable Member

I have two separate Mini+s. 

First Mini - 1.675 on smooth sheet, used zip tie measurement. 

Second Mini - somewhere .800 - 1.000 on smooth sheet, used 1.5mm measurement.

I haven't calibrate texture sheet on both printer, yet. Planned to do it shortly.

Posted : 13/09/2021 3:27 pm
Richard D
(@richard-d)
Eminent Member
move the PINDA ...

FWIW, after moving the SuperPINDA several times (as well as disassembling the hot end - including swapping nozzles and the heatbreak, after each of which it is necessary to recalibrate) my Mini+ is now holding at -0.770 on the smooth sheet and -1.200 on the satin sheet (although I haven't recalibrated to use the satin sheet since my last changes, so that might not be accurate).

If you are getting values higher than -1.200 on the smooth sheet I'd definitely recommend resetting the height of the PINDA (I use a credit card between it and the steel sheet).  

Posted : 13/09/2021 3:36 pm
cwbullet
(@cwbullet)
Illustrious Member
Advice

That is sound advice.  

Posted by: @richard-d

FWIW, after moving the SuperPINDA several times (as well as disassembling the hot end - including swapping nozzles and the heatbreak, after each of which it is necessary to recalibrate) my Mini+ is now holding at -0.770 on the smooth sheet and -1.200 on the satin sheet (although I haven't recalibrated to use the satin sheet since my last changes, so that might not be accurate).

If you are getting values higher than -1.200 on the smooth sheet I'd definitely recommend resetting the height of the PINDA (I use a credit card between it and the steel sheet).  

 

--------------------
Chuck H
3D Printer Review Blog...
Posted : 13/09/2021 3:43 pm
Share: