automatic material shrinkage compensation

[lukeskymuh]

Version

2.0.0

Operating system type + version

Win 10

3D printer brand / version + firmware version (if known)

i2 MK3

Behavior

Hi,
it is known that prints shrink due to the temperature change from printing to room temperature due to their coefficient of thermal Expansion (CTE). I have analyzed this and this is main dimensional erreor for my MK3.
It would be great if the slicer would have a function to scale your prints in dependancy of the CTE of the material and the heatbed temperature.
Do you think this is possible to implement this feature?
Some links about this topic:
https://www.thingiverse.com/thing:2484766
https://www.youtube.com/

_Is this a new feature request?_yes

[MStylesMS]

I agree with this request. Having a default shrinkage factor for each filament profile based upon the middle range of the range of the printing temperature vs a typical ambient temperature (say 22.5C). This would make sense one the Advanced page of the filament definition.

[neophyl]

This has been implemented in Super Slicer. I don't know how well it works as I have not used it as yet but its there as one of the filament settings.
https://github.com/supermerill/SuperSlicer

[manolitto]

This has been implemented in Super Slicer. I don't know how well it works as I have not used it as yet but its there as one of the filament settings.
https://github.com/supermerill/SuperSlicer

SuperSlicers "Shrinkage" feature only auto-scales in x and y direction but not in z !?
see here
At least that is how it is documented. This makes no sense IMHO if you want to compensate CTE.

Simplest solution for CTE compensation:
a new "scaling factor" filament setting which auto-scales printed objects in x, y and z.

Most flexible and future proof solution for CTE compensation:
three "scaling factor" filament settings - one for each axis

[manolitto]

This has been implemented in Super Slicer. I don't know how well it works as I have not used it as yet but its there as one of the filament settings.
https://github.com/supermerill/SuperSlicer

SuperSlicers "Shrinkage" feature only auto-scales in x and y direction but not in z !? see here At least that is how it is documented. This makes no sense IMHO if you want to compensate CTE.

I learned that SuperSlicer is doing right by just compensating in x and y. Reason is: the z size is given by the vertical steps which are always exact. So, every single layer is printed exactly at the height it should be - regardless of the shrinking of already printed layers.

So I propose this instead:

Simplest solution for CTE compensation: a new "scaling factor" filament setting which auto-scales printed objects in x, y

Most flexible and future proof solution for CTE compensation: one "scaling factor" filament setting for x and y compensation

[Gefionious]

This I think is the last remaining feature I love with Simplify3D although I have transitioned 99% of my work to PruseSlicer. They have both an import model script feature as well as a dimensional XY correction in the setup. Is a great feature to add for the overall printer (if I consistently print +-) but now I am printing ASA and other higher shrinkage filaments it is more important as a filament override. https://www.simplify3d.com/support/print-quality-troubleshooting/dimensional-accuracy/
Please add to PrusaSlicer!

[Gefionious]

I should note, that it appears there are work-arounds available... I am looking at this: [https://www.thingiverse.com/thing:2484766#Summary]
I think it is very possible to add g-code via the M92 steps per mm correction in a script, perhaps even checking the filament profile. Something to consider.

UPDATE: I used that thingverse technique (link above) and for my printer and printing 3DMAX ASA, I added the following command to the Filament Settings / Custom G-code / Start G-code: M92 X99.77 Y99.75 Z396.83 (which is very specific for my printer and this filament and is the result of the calibration process) and then added the following code to the Filament End G-code of M501 (again for the Prusa firmware, M501 reloads settings from EPROM which undoes the custom command above).

End Result! My 25x25x25mm cube printed with ASA originally measured 24.75x24.8x25.2mm and now after it is 25.04mmx24.96mmx24.98mm! Very happy! I could tune it further but this is well within any accuracy needs I have.

I do have an open question about how much this is impacted by layer height, I was printing in 0.2. Now may need to do some more testing on other layer heights.

[ruredi87]

Guys please add this feature to prusaslicer I am begging. I dont know, is it too hard to implement this? Almost all other slicer has this feature and I think it is extremely important feature for the people who prints engineering parts. I see first topic is opened in 2019. You can take a look superslicer's filament shrinkage ratio. It is probably too simple to add for you guys. PLEASEEE @kubispe1 @hejllukas

[johnkray]

Chiming in to say I would really like to see this feature as well!