Raspberry Pi Thincase with screw & friendly with abs (model B+ / 2 / 3)

Thanks Adrien12

i followed Adrien12 designed with thicker shell and screw version.

Adrien12 made wonderful model but with abs the locking pole is very weak
so i designed a new model with screw need.

you need m1.7 or m2 screw wich longer than 5mm hight

thanks