I have found an excellent LED Strip soldering tool from @spusuf. But it's quite big when you need to keep them on the light strip (eg. if you need to connect your strip in the corners).
This version is shorter and lighter so you can print a lot of them and keep them on the strip when you are connecting two strips together.
The model is adapted to the LIDL Livarno LED Light strip with 6 pins, 12 mm width and transparent coating.
Printed with PLA at 0.2 mm (QUALITY) without any supports.
The author remixed this model.