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Prints do not keep dimensions in Z axis  

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marcin.c
(@marcin-c)
Trusted Member
Prints do not keep dimensions in Z axis

Hey guys.

I have this odd problem which is my prints keep comming out inaccurate in Z axis. For example something is 164mm tall instead of 159, 91mm instead of 89mm and such. Any idea what's wrong and how can I fix it? It makes printing big, multiple part objects impossible :<.

Postato : 11/07/2016 11:21 pm
PJR
 PJR
(@pjr)
Antient Member Moderator
Re: Prints do not keep dimensions in Z axis

Marcin

Is this a slicer issue? Check the GCode files to see the final layer height in GCode.

Are you using Mk1 or Mk2?

Peter

Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…

Postato : 12/07/2016 9:38 am
marcin.c
(@marcin-c)
Trusted Member
Topic starter answered:
Re: Prints do not keep dimensions in Z axis

Sorry for the late reply but I've been busy. Okay so I'm using Mk 1 and the problems is most likely not software related since it happens with Cura and Simplify3D.

Postato : 17/07/2016 1:14 am
PJR
 PJR
(@pjr)
Antient Member Moderator
Re: Prints do not keep dimensions in Z axis

Marcin

Have a look at the GCode (open it with a text editor such as Notepad++) to see what height Z is set to for the last layer.

Either that or upload the GCode and I will have a look for you. You will also need to tell me the height of the printed model for the uploaded GCode.

Peter

Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…

Postato : 17/07/2016 11:37 am
Vojtěch Bubník
(@vojtech-bubnik)
Utenti Admin
Re: Prints do not keep dimensions in Z axis

> I have this odd problem which is my prints keep comming out inaccurate in Z axis. For example something is 164mm tall instead of 159, 91mm instead of 89mm and such. Any idea what's wrong and how can I fix it? It makes printing big, multiple part objects impossible :<.

This is weird. We would expect the objects to be shorter instead of taller, if the motors skip steps. Are you sure the objects are longer?

Would you please provide us with your G-code?

Thanks, Vojtech

Postato : 18/07/2016 5:36 pm
marcin.c
(@marcin-c)
Trusted Member
Topic starter answered:
Re: Prints do not keep dimensions in Z axis

Sorry for taking this long, busy week ;). Anyway, here's everything you've asked

https://mega.nz/#!JoQ1SIhR

Postato : 24/07/2016 12:49 pm
PJR
 PJR
(@pjr)
Antient Member Moderator
Re: Prints do not keep dimensions in Z axis

The download is requesting a decryption key. Can you zip up the file and upload it to here (drag and drop on a new post).

Thanks

Peter

Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…

Postato : 24/07/2016 1:00 pm
marcin.c
(@marcin-c)
Trusted Member
Topic starter answered:
Re: Prints do not keep dimensions in Z axis

Sure, when I saw it doesn't accept gcode files I decided to use Mega instead ;).

Postato : 24/07/2016 1:08 pm
PJR
 PJR
(@pjr)
Antient Member Moderator
Re: Prints do not keep dimensions in Z axis

OK, so the last layer (796) is set to print at 159.18.. Layer 1 is set to 0.18, and the remaining layers to 0.2mm.

That is an issue with the Mk1 as the first layer minimum is 0.23mm, but that will be compensated by over extrusion on the second layer.

Question: what firmware are you running on the Mk1?

Peter

Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…

Postato : 24/07/2016 1:21 pm
PJR
 PJR
(@pjr)
Antient Member Moderator
Re: Prints do not keep dimensions in Z axis

OK, there are 2 things I can think of:

1. Factory Reset
2. include the code "M92 E4000" in the start GCode (without the quotation marks).

Peter

Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…

Postato : 24/07/2016 1:29 pm
marcin.c
(@marcin-c)
Trusted Member
Topic starter answered:
Re: Prints do not keep dimensions in Z axis

Thank you. I will test it as soon as I can and let you know if it works. My firmware version is 2.2.1 (Mk 1) btw 🙂

Postato : 24/07/2016 3:32 pm
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