No 3mf thumbnail shown

[GMagician]

Application Version

5.2.2

Platform

Windows 11

Printer

Custom

Reproduction steps

Whenever any 3mf containing a file with double #n (e.g. 'myprinter_extruder_0 #2_user #2.inst.cfg' windows doesn't display thumbnail. To see it just open 3mf with 7zip and rename a 'Cura/' file.

Now I've not enough knowledge to know if this is a "malformed" 3mf or a windows thumbnail viewer issue, erase this if latter

Actual results

3mf cura icons is used

Expected results

thumbnail image as icon

Checklist of files to include

• Log file
• Project file

Additional information & file uploads

No needs for a specific 3mf or printer configuration

[MariMakes]

Hey @GMagician,

Thanks for your report 👍
I was able to reproduce it by following your exact steps.
But not in another way.

Can you help me understand why this is a bug?
How is this limiting you or others in working with Cura?

[GMagician]

I think it's a bug because thumbnail should be shown.
Question is:
Does such filename turn this 3mf file into a malformed 3mf (then windows doesn't display image) or it's just the windows viewer bugged? I don't have enough knowledge to discriminate, but someone here for sure

This bug doesn't limit anything, it's just lost the possibility to see at a glance what is contained into a 3mf.

[GMagician]

Oh I forgot. Cura may create such filenames (with 2 #) when a 3mf is loaded and then saved. Usually I see it if 3mf was originally saved by old printer and loaded + saved with new one. Not detected properly when this occurs. Maybe when 'groupid' changes (in global.cfg)

[MariMakes]

Quick Update.

I found this report of someone who encountered this on accident.
https://community.ultimaker.com/topic/42962-renderings-not-showing-when-i-open-previous-files-sometimes/

So it seems more serious than we initially thought.

[MariMakes]

Hey @GMagician,

Quick update on our side.
We've added a ticket to the backlog with the intent to improve this.
For internal reference CURA-10573

Thanks for the report! 👍