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prusa3d / PrusaSlicer

G-code generator for 3D printers (RepRap, Makerbot, Ultimaker etc.)
https://www.prusa3d.com/prusaslicer/
GNU Affero General Public License v3.0
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original coordinates seem to be forgotten after closing and reopening a project (.3mf) #8990

Open markus-i opened 1 year ago

markus-i commented 1 year ago

Description of the bug

Couldn't find the issue already - but I'm afraid my ususal google-fu seemed at a loss as to how describe the search terms properly. Someone surely has seen and reported this before?

So, what happened:

My suspicion: as long as I am working with the .3mf after importing the original body, the transformation how to get the body into its position on the printing plate is kept in memory and applied directly to any modifiers I add to the body. Once I close the .3mf (and/or when I open it again - but closing seems more probable) this transform is remved and only the coordinates relative to the printing plate are retained. Any new bodies/modifiers added afterwards are added with the (in my case pretty much arbitrary) offset between the body in f3d coordinates andd the body on the printer plate.

Background: the body is for a speaker box for a car (Citroen Ami/Opel Rocks-E), which is modelled from a scan of the dashboard to fir as good as possible intl the available space. Therefore, the absolute position and orientation of the body is pretty much arbitrary in F360's coordinate system.

Maybe a few pictures will help: This is what it looks (with an easily generated test modifier) in F360:

f3d_test

This is what I expect to see in PrusaSlicer (using a .3mf that I never closed and re-opened):

test_correct

And this is what I see if I import the same modifier (same .stl) into a stored and re-opened version of the same .3mf:

modifier_test

If you attempt to repro, you of course won't be able to get that modifier into the correct position, since you'll be forced to work from a stored .3mf...

Project file & How to reproduce

.3mf file: links_test.zip

the stl for the additional modifier: test.zip

How to reproduce: You'll probably have to start with your own F360 project, as I can't send you the "virgin" .3mf from my PC... 1) create a F360 project with some sort of body at an arbitrary location and orientation, not on the coordinate origin 2) create a few more bodies relative to the first body (again, without paying any respect to F360's coordinate system), possibly intersecting that body (i.e. useful as modifiers - might also work for MMU designs) 3) import the original body (.stl) as body into Prusa Slicer 4) import the additional bodies (.stl's) as modifiers into Prusa Slicer 5) save the .3mf and close Prusa Slicer 6) create at least one more modifier body in F360 and export the .stl 7) Start Prusa Slicer and open the .3mf from the previous session 8) import the new modifier (from step 6)... and keep looking for it until you find it...

Checklist of files included above

Version of PrusaSlicer

Version 2.5.0+win64

Operating system

Windows 10

Printer model

Prusa i3 Mk 3 w/ MMU 2S

kubispe1 commented 1 year ago

I think you are totally right. Original coordinates system is ignored or lost. Only option that could be available is : ''Reload from disk (https://help.prusa3d.com/article/reload-from-disk_120427) So you need to 1) update your .slt /. step - rewrite file ! than 2) reload from disk according help link Please, can you try it and then write, if it suits of your workflow or if there are some issues or improvement, you would like to see.

markus-i commented 1 year ago

I think you are totally right. Original coordinates system is ignored or lost. Only option that could be available is : ''Reload from disk (https://help.prusa3d.com/article/reload-from-disk_120427) So you need to 1) update your .slt /. step - rewrite file ! than 2) reload from disk according help link Please, can you try it and then write, if it suits of your workflow or if there are some issues or improvement, you would like to see.

Sorry about the delay in responding, but I only got to do some f3d/printing on the weekend... Ok, I think I tried what you were suggesting, but it didn't work out this time. I'll go through the various permutations of which .stl to update and reload once I find the time for it (that design is now pretty much done, so there's currently no pressure here - I'm just pouring the concrete into it, one layer of 250 grams per day...).

What I tried was:

kubispe1 commented 1 year ago

Hello @markus-i , I was not able to reproduce it last time. Now I find the path to reproduce it in PS 2.5.0 and also in recent release. There is probably some inconsistency in saving to 3mf. Conclusion: