Inside Spool Wall Filament Clip (1.75mm)

This filament clip keeps the end of the filament inside the walls of the spool unlike some of the other popular designs. I found that if they clipped on the side of the spool holder the clip would pop off the second another spool was put next to it. This design solves that problem. 

Note: This filament clip will only work for 1.75mm filament. If people want a 3mm one I can create one but since I have no 3mm filament to test it with I can't ensure it'll work...