Flat belts buckles - 10,15,18,20 mm - very strong design

Hi, this is a 31mm flat belt buckle with multiple uses for 10,15,18 or 20mm belts. Very strong design, 

In the video below, I show the resistance of the 25mm belt version and follow the assembly and where to find the spring easily.

Optimized for 0.4 nozzle.

Suggest print:

• Print in ABS, Nylon, PC, HIPS
• layer 0.2
• 3 perimeters (wall 1.2mm)
• infill 100%