That is colour in the viewport for F6.
I don't think colour in the export that can print is ready?
Certainly multi-materiel support is more complex.

On 10/19/25 18:10, Marius Kintel via Discuss wrote:

Done. Thanks Marius.

Cheers, Gene Heskett, CET.

"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.

• Louis D. Brandeis
  Don't poison our oceans, interdict drugs at the src.

On 10/19/25 19:04, Michael Marx (spintel) via Discuss wrote:

This is where there needs to be a consensus as to the method
this info is sent in a .3mf.  .stl's are probably hopeless. I don't
use them if I can help it.  Or is there another data format std
that already does that?  And existing slicers accept it.  IDK.

Bambu labs or creality may have that figured out, if they can
be convinced to disgorge it.  That likely is a whole other can
of worms. . . I may live to regret mentioning this, maybe, at 91
I am well aware of the limited time I have left.

Thanks.

Cheers, Gene Heskett, CET

--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.

• Louis D. Brandeis
  Don't poison our oceans, interdict drugs at the src.

Hi Gene,

You can spend many a happy day going through this site
https://docs.fileformat.com/

On 20/10/2025 02:15, gene heskett via Discuss wrote:

On 20.10.25 03:15, gene heskett via Discuss wrote:

Well, slicers have declared how it works. I doubt we can
influence it much. That said, 3MF seems to be the best
choice by far.

My experience is essentially only Prusa Slicer, most of
this should at least apply to all Slic3r derived apps like
Bambu Studio. I don't know much about the Creality Slicer.

So for Prusa Slicer we have:

1. Color has no meaning at all for multi-material printing!
   Really! None! Not at all!
   That's from STL hacking days.

2. Multi-material is defined by multiple separate objects
   defined in the 3MF as supported by the specification. But
   I don't think it's handled 100% in the way it's intended.

3. "Color painting" in slicers seems to be specific to the
   slicer, while similar even Bambu Studio and Prusa Slicer
   use slightly different definitions. As far as I can tell,
   the Prusa Slicer way, while not officially using the 3MF
   specification is at least a specification compliant
   extension.
   Bambu Studio uses a definition which seems to be a spec
   violation.
   OpenSCAD has no way of writing either of those values
   as the official 3MF reference implementation we are
   using does not support those extension (yet?).

3MF supports:

• A list of "build-items".

• Each build item contains 1 or many objects, which can be
  either meshes or object composed from component objects
  which are in turn again either meshes or components. The
  objects can have some associated transformations (like
  scaling) so one mesh definition in the file could be used
  to generate multiple objects in different sizes.

At this point it looks like slicers ignore the build-item
distinction and just treat things as one object tree. If
they find multiple objects, they pop up a question if it
should be treated as separate slicing objects or as one
object with multiple parts.

ciao,
Torsten.

On 10/20/25 06:53, Torsten Paul via Discuss wrote:

Mine too, ever since I discovered PrusaSlicer and its derived clones,
but prusa
has switched to flatpaks and I have 2 problems with that, the first
being the
50,000 bloat of files in installs, and the second being I've not been
able to actually
make one of them work on this machine.

But this machine has been a disaster from the first install of bookworm.
Dan Ritter on another list, gave me a command that was supposed
to detect which window manager I was using, and it came up null,
yet I have a dozen workspaces all lined up in the pager on the bottom
lines of my display, supposedly running xfce4 for its GUI.

And I have a total, use the reset button to reboot, freeze at nominally
10 to 14 day periods. So the question then is what window manager
SHOULD I have installed while using xfce4?

That command was:
 gene@coyote:~$ ps auwx | grep wm
gene        3882  0.0  0.3 924964 109556 ?       Sl   Oct10   0:10
/usr/bin/akonadi_newmailnotifier_agent --identifier
akonadi_newmailnotifier_agent
gene     1509443  0.0  0.0   6412  2252 pts/6    S+   02:56   0:00 grep wm

IOW, no window manager. htop can't find one either..  Acc synaptic its
xfwm4, and I just reinstalled it. And still can't find it running. I'll
check again after the next lockup & reboot. After I send this, i'll try
running it from a shell.

Cheers, Gene Heskett, CET.

"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.

• Louis D. Brandeis
  Don't poison our oceans, interdict drugs at the src.

On 10/20/25 11:22, gene heskett via Discuss wrote:

me to use the --replace option the first time and exited, So I tried
that, fully expecting a system crash, but just that shell never
returned. Everything else is still running.  So I'll leave it till the
next lockup. Crazy, swapping wm's from Kwin to xfwm4 on a running machine.

Someday, maybe. Consensus will have to come first. I'm not
holding my breath. . . .  Thanks for tolerating me.

The 2.8.1 version I'm using treats multiple individual parts as
separate objects, that C clamp image I posted shows up as 5
arbitrary but identical named files in the output window.

Cheers, Gene Heskett, CET.

"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.

• Louis D. Brandeis
  Don't poison our oceans, interdict drugs at the src.

On Mon, 2025-10-20 at 11:46 -0400, gene heskett via Discuss wrote:

This discussion has cleared up something that's been bothering me for a
long time.
I could not figure out why, when using Bambu Studio, a model with a
hole in it, when split, either into objects or into parts (can't recall
which), will drop the hollow part to the bed.

It's done that way because the 'hole' is not treated as a lack of mesh
(or triangles?), but as a negative object.

I have also learned a lot about 3MF files as Bambu Studio or Prusa uses
them, and will be doing some investigating.

On 10/20/25 12:03, larry via Discuss wrote:

And what I thought was probably an offtopic (for this list) item,
ladies and gentlemen, is how humanity learns. Tweaking someones
curiosity bump. . .  I started a bit earlier than some, I asked my
mother when I was 6, what gravity was. She didn't know, but she
knew where the library was & bought home a copy of the senior
physics text book, which we carefully read to find they didn't
know when that book was published in the 1938.  And
there is still some confusion about its propagation velocity. Which
until we learn how to manipulate it, we have no way to measure.
Instant, our orbital math works, slow it down to C speed and orbital
math needs a fudge added to work as observed.

Thank you all.

Cheers, Gene Heskett, CET.

"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.

• Louis D. Brandeis
  Don't poison our oceans, interdict drugs at the src.