How I got it to work on Ubuntu 26.04

[ancientsofscripting]

How to Install a STL thumbnailer

Required

sudo apt install git
sudo apt install mailcap

Files

wget https://github.com/unlimitedbacon/stl-thumb/releases/download/v0.5.0/stl-thumb_0.5.0_amd64.deb

Steps

sudo apt install ./stl-thumb_0.4.0_amd64.deb
or double click on the file to install

git clone https://github.com/MLAB-project/stl-thumbnailer.git
cd stl-thumbnailer

sudo cp stl_thumb.py /usr/local/bin/
sudo chmod a+x /usr/local/bin/stl_thumb.py
sudo cp stl.thumbnailer /usr/share/thumbnailers/
mkdir -p ~/.local/share/mime/packages/
cp stl.xml ~/.local/share/mime/packages/

update-mime-database ~/.local/share/mime/
sudo update-mime

rm -rf ~/.cache/thumbnails/*

killall nautilus

Launch Nautilus and test

Reboot the system if it's not working

Possibly disable apparmor (Not required on Ubuntu 26.04)

How to Install a 3mf thumbnailer

Required

sudo apt update
sudo apt install git
sudo apt install mailcap
sudo apt install libzip-dev zlib1g-dev
sudo apt install build-essential pkg-config

Files

• git clone https://github.com/themanyone/3mfthumb.git
  cd 3mfthumb
• 3mf.xml

https://github.com/3MFConsortium/lib3mf/releases
sudo apt install ./lib3mf-2.5.0-Linux.deb
or double click on the file to install

Steps

Edit the 3mfthumb.cpp '#include <Bindings/Cpp/lib3mf_implicit.hpp>'
make clean
make
sudo cp 3mfthumb /usr/local/bin/
sudo chmod a+x /usr/local/bin/3mfthumb
sudo cp 3mf.thumbnailer /usr/share/thumbnailers/
mkdir -p ~/.local/share/mime/packages/
cp 3mf.xml ~/.local/share/mime/packages/

update-mime-database ~/.local/share/mime/
sudo update-mime

rm -rf ~/.cache/thumbnails/*

killall nautilus