JPL Badge sliders

***Update Rev D: The sliders have been modified to be slightly thicker, move the bottom catches, and have a notch for the PIV chip. Modifications were done to avoid any unintentional contact with the chip during loading and unloading (not that it has been a problem, but, hey, overengineering.

***Update Rev C: The sliders have been modified to be less "sweater-catchy" by removing most of the right angles. Also, more sturdy, better fit, and overall improvements. More designs added. OBJ fil