Here are your options:

1. You can download an AppImage from https://slic3r.org/ 

2. Pull the package from Sid: https://packages.debian.org/sid/amd64/slic3r/download

3. Download the src package and compile yourself

As far as I can tell, there were problems in the package and Debian opted not to put it in Stable, but it is in Sid, so chances are, it will work if you are ok with the warnings

https://tracker.debian.org/pkg/slic3r

Good luck

-nick


On Tue, Oct 28, 2025 at 9:12 AM Colin McGregor via Talk <talk@lists.gtalug.org> wrote:
I have / like my 3D printer, but... At present I go to sites like
Thingiverse where I can (normally) search for / find a .stl file to
download that describes an object that I want. My 3D printer wants to
see a .gcode file which describes what path the 3D printer's print
nozzle should follow (ie: devil is in the details, a perfect .gcode
file for a Brand A printer could cause problems for a Brand B
printer). Okay, there is software available that will take .stl files
and convert them to .gcode files while taking into account the ...
quirks ... of different printer makes/models.

For the last while I have been using the program "Slic3r" to do this
.stl to .gcode conversion, because it is good, fast, easy to use, and
free. Problem, in early August I moved my main desktop PC from Debian
12 to Debian 13 and the "Slic3r" program isn't available in the
default Debian 13 repository. Also I have been unable so far to get
the "Slic3r" flatpack file to run, all meaning getting "Slic3r" to run
on my desktop machine will be no joy :-( . I have tried to find
another .stl to .gcode conversion program for my main machine, so far
without success :-( .

My solution while not perfect, does work is to put one of my Raspberry
Pi 5's to work, running "PrusaSlicer"... I'll do the grumpy old guy
thing of noting I'm not super keen on the differences between "Slic3r"
and "PrusaSlicer", but ... better a working but flawed (or at least
different) ... software tool than no software tool.
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