Posts: 3
Joined: Wed Aug 05, 2015 7:58 am

Material Shrinkage/Expansion Import Profiles

Mon Dec 28, 2020 3:44 pm

This has been an issue many of you already commented on in the past but I would like to yet again bring it up for consideration.

I only print with two materials at the moment, those two are PLA and PETG. And my printer (MK3S) prints perfect looking parts right out of the box with imported official Prusa profiles. The only issue I'm having is that PLA parts tend to get bigger and PETG parts get smaller than the original CAD model size.

So we are basically talking about shrinkage. And this is pretty easy to fix by just scaling the parts when they are imported to Simplify3D. However it is annoying to have to manually change the percentage between materials.

I know you guys have implemented the "horizontal size compensation" a long time ago but this only changes X and Y, and also it changes them with the same value.

I would like to see selectable shrinkage profiles either when importing files or if you could open up "horizontal size compensation" so every axis could be changed independently.

Could anyone please comment if there is a better way of doing this that I've missed (I don't want to change anything printer firmware wise since it's running percetly) OR, could anyone from Simplify3D explain to me why this/these features couldn't be implemented?

Attached are pictures of my shrink/expansion values that give me a box of 20x20x20mm within ±0.01mm accuracy (Measured with micrometer).
PLA Scaling.PNG
Import Scaling PLA
PLA Scaling.PNG (2.6 KiB) Viewed 2043 times
PETG Scaling.PNG
Import Scaling PETG
PETG Scaling.PNG (2.43 KiB) Viewed 2043 times

Posts: 3
Joined: Wed Aug 05, 2015 7:58 am

Re: Material Shrinkage/Expansion Import Profiles

Thu May 20, 2021 12:26 pm

Nothing? Not even a NO?

Posts: 138
Joined: Fri May 18, 2018 11:13 pm

Re: Material Shrinkage/Expansion Import Profiles

Thu May 20, 2021 1:44 pm

I'd consider any X-Y error less than 0.1mm pretty darned accurate; Z error has the potential to be higher because it all depends on how well you calibrated the bed height. FDM printers aren't designed for extremely high precision; an SLA printer will give you that. According to my calculations, the absolute differences in each axis are:

X: 0.09mm
Y: 0.08mm
X: 0.14mm

I'd take those accuracies any day.

Posts: 374
Joined: Tue Mar 06, 2018 10:35 am
Location: Philadelphia PA Area

Re: Material Shrinkage/Expansion Import Profiles

Fri May 21, 2021 9:22 am

you sure you have extrusion multiplier and filament diameter accurately set for that particular roll or section of filament.. it can makes a difference in size .1 in multiplier can be the difference in go no-go in holes. Also correct z offset for layer height will change over all height by the amount it is off be it too close or too far.. I try and keep z offset within .02+- of dead on meaning a 3mm tall object will be 2.98 - 3.02 tall X and Y I can't adjust and normally are perfect to .02 small.

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