This is a one-way snap on.
This knob can be used for holes without gaps.
step 1. Hook paper clip on zipper hole.
step 2. Insert clip into the body. (may need pliers)
step 3. When you hear a click, it is completed!
We also uploaded notched parts.
To add a clip to your object, subtract this part.
Check it out and let me know what you think.
material : Solutech PLA (glow in dark)