Print dimensions don't match design

Discussions about firmware/slicing software, tweaks and settings
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daveinhull
Posts: 66
Joined: Fri Jan 11, 2013 2:31 am

Print dimensions don't match design

Post by daveinhull »

Hi,

I've now got my V3 upgraded printer working and the prints look very good in deed. No more z-axis wobble; nice clean surfaces :D

However, I'm seeing some minor problems with dimension where the print size does not match the design size (I'm using Creo Elements as the design package). There is just a small difference, but enough to make the prints unstable at times.

Some differences seen
20mm = 18mm, about 90%
8mm = 7mm, about 87.5%
3mm = 2.25mm(ish), about 75%

So I suspect the actual size difference is around 87 to 90% mark.

Can this be adjusted in software?

Many thanks
Dave

Hugues
Posts: 270
Joined: Thu Apr 04, 2013 5:36 pm

Post by Hugues »

Yes it can,

i used to do it this way:

- extract a bit of plastic and remove it, but let the rest ooze out slowly
- bring the extruder down to touch the build plate, you should have a little plastic spot
- move your extruder by 200mm in X (or 150,..) using the sofwtare
- bring down the extruder again to mark a second plastic spot
- move the extruder out of the way
- measure the distance between the 2 plastic spot, it should match your 200 or 150mm move
- if not, you can adjust the number of steps in the software menu
- i don't have the soft open now, but it's in one of the first menu, called firmware i think, you can see how many encoder steps per mm and you can change that value
- decrease or increase it proportionally to your measured error
- repeat the procedure again until you are satisfied
- then do the Y axis
- for Z, just measure a fix spot on the build plate
Hugues
Regards from Switzerland

daveinhull
Posts: 66
Joined: Fri Jan 11, 2013 2:31 am

Post by daveinhull »

Hi Hugues,

Many thanks. I sort of found the setting and was trying with a pen mark but your idea is far better.

Thanks
Dave

Hugues
Posts: 270
Joined: Thu Apr 04, 2013 5:36 pm

Post by Hugues »

Also remember to measure your model once it has cool down, because it will shrink a bit.

Normally, the first layer printed on the bed might measure a bit more because it is often "squahed" down on the plate, measure above the first layers preferably.
Hugues
Regards from Switzerland

salman550
Posts: 1
Joined: Wed Jan 14, 2015 1:44 pm

Post by salman550 »

this is very nice post :D
Nawaz

olce
Posts: 9
Joined: Sun Aug 31, 2014 9:29 am

Post by olce »

Hi,

just for reference.

here is a nice and good calibration method and fairly detailed.
Model + instructions: http://www.thingiverse.com/thing:195604

it may involve some test prints before calibration is completely done.

O.
Felix 3D 3.0, DUAL extruder setup
Firmware: 20141107 - FIRMWARE - Repetier 0.92 - FELIX_3_0_DUAL_extrusion
RepetierHost : FELIX Printers 1.0.6

seaton
Posts: 291
Joined: Tue May 14, 2013 9:04 am
Location: Bunbury, Western Australia
Contact:

Post by seaton »

daveinhull wrote:Hi,

I've now got my V3 upgraded printer working and the prints look very good in deed. No more z-axis wobble; nice clean surfaces :D

However, I'm seeing some minor problems with dimension where the print size does not match the design size (I'm using Creo Elements as the design package). There is just a small difference, but enough to make the prints unstable at times.

Some differences seen
20mm = 18mm, about 90%
8mm = 7mm, about 87.5%
3mm = 2.25mm(ish), about 75%

So I suspect the actual size difference is around 87 to 90% mark.

Can this be adjusted in software?

Many thanks
Dave

If performing the calibration checks where you normally print, or try at different spot on both X and Y, I had problem where the belts had stretched and my calibrations were fine in one spot but out terribly in another, it was then I realised my belts had stretched in that spot it was out.
Stephen...

Felix 2.0 -> Felix 3.0 dual
Simplify3D Slicer, Kisslicer
Have you added your Felix to the Map? http://goo.gl/maps/HajnZ

http://blog.strobotics.com.au

mrcncap
Posts: 3
Joined: Fri Aug 21, 2015 1:09 am

Post by mrcncap »

remember that plastic shrinks as it cools so don't forget to scale your model to the shrink rate of the material you are using.
daveinhull wrote:Hi,

I've now got my V3 upgraded printer working and the prints look very good in deed. No more z-axis wobble; nice clean surfaces :D

However, I'm seeing some minor problems with dimension where the print size does not match the design size (I'm using Creo Elements as the design package). There is just a small difference, but enough to make the prints unstable at times.

Some differences seen
20mm = 18mm, about 90%
8mm = 7mm, about 87.5%
3mm = 2.25mm(ish), about 75%

So I suspect the actual size difference is around 87 to 90% mark.

Can this be adjusted in software?

Many thanks
Dave

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