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Removing a +1mm over size scale.

Posted by GRAYWOLF

GRAYWOLF

Removing a +1mm over size scale.
June 04, 2015 02:06AM

Registered: 9 years ago
Posts: 288

Am I just trying to hard?
I just ran the 20mm test cube test and it came out at 21mm.
I'm running an Ooznest Prusa i3 and wondering how to calibrate the printer/cura to remove the +1mm overscale.

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o_lampe

Re: Removing a +1mm over size scale.
June 04, 2015 02:26AM

Registered: 9 years ago
Posts: 5,232

When I measured a test cube, I always got more than one size. Differing from eg. 19.678 to 20.123mm

You´re saying 21mm. Period.
That sounds unrealistic to me. You should use a caliper to measure.

If there really is a constant 5% error in scale you only have to reduce the steps/mm in Marlin FW for x,y,z by 5% and you´re done.
-Olaf

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madmike8

Re: Removing a +1mm over size scale.
June 04, 2015 02:40AM

Registered: 10 years ago
Posts: 814

Triffid Hunters Calibration Guide

Still a good read...

Edited 3 time(s). Last edit at 06/04/2015 02:45AM by madmike8.

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GRAYWOLF

Re: Removing a +1mm over size scale.
June 04, 2015 01:32PM

Registered: 9 years ago
Posts: 288

Quote
o_lampe
When I measured a test cube, I always got more than one size. Differing from eg. 19.678 to 20.123mm

You´re saying 21mm. Period.
That sounds unrealistic to me. You should use a caliper to measure.

If there really is a constant 5% error in scale you only have to reduce the steps/mm in Marlin FW for x,y,z by 5% and you´re done.
-Olaf

Yup digital calipers, Ozznest kit really is that good!

Quote
madmike8
Triffid Hunters Calibration Guide

Still a good read...

Will look into it.

Thanks for replying.

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GRAYWOLF

Re: Removing a +1mm over size scale.
June 06, 2015 01:02PM

Registered: 9 years ago
Posts: 288

Ok I'm lost, I can't find the settings.
are they in Configuration.h or a different file?

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IMBoring25

Re: Removing a +1mm over size scale.
June 06, 2015 01:47PM

Registered: 9 years ago
Posts: 351

If you're still running Marlin there should be one or more instances of #define DEFAULT_AXIS_STEPS_PER_UNIT in Configuration.h. The matrix that follows will define steps per mm for X, Y, Z, and Extruder axes.

Edited 1 time(s). Last edit at 06/06/2015 01:48PM by IMBoring25.

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GRAYWOLF

Re: Removing a +1mm over size scale.
June 06, 2015 03:40PM

Registered: 9 years ago
Posts: 288

Quote
IMBoring25
If you're still running Marlin there should be one or more instances of #define DEFAULT_AXIS_STEPS_PER_UNIT in Configuration.h. The matrix that follows will define steps per mm for X, Y, Z, and Extruder axes.

Thanks alot dude

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alan richard

Re: Removing a +1mm over size scale.
June 07, 2015 01:31PM

Registered: 10 years ago
Posts: 158

Measure your travel distance over a longer length before changing travel Steps/mm in config.

1mm over 20mm could be over extrusion

-a