My T-Nuts never worked properly—they were either too small, too fragile, or didn't fit through the board. So, I created my own version. All you need is an M3 screw. The hole is tight enough to hold the screw securely. I recommend inserting the screw before installing it on the model to ensure a better fit.

L-Version
If the model has multiple holes aligned vertically, you can use these. They function similarly to the integrated hooks of the model. You can also enhance other models by removing the L-Hook and inserting an M3 hole to mount this hook.

T-Version
This version works like a traditional T-Nut, but you only need to screw it in—no glue required. It functions perfectly as intended.

Feel free to modify or add to the design as needed. Here is the Tinkercad link: Tinkercad - Skadis Nuts.