This is a remix of http://www.thingiverse.com/thing:1969059
Great idea and makes you printer look even more awesome! I made this remix because I prefer screws and nuts over snap fit joints. I used Tinkercad to combine the original endcap STL file (V1) and a screw I designed in OpenSCAD. Use two countersunk M4 x 8 mm screws and two hammer T-nuts per endcap to mount this version of the endcap.