TS 2040 2020 Rail Carriage for Prusa i3 Accessories, Toranado

I designed this carriage primarily for the TEVO Tarantula so it can mount the Toranado 1.1 Precision Geared Extruder found at:
http://www.thingiverse.com/thing:1246951

UPDATE: I have learned that the TEVO Tarantula doesn't use the OpenBuild V Slot rails. I am uncertain how well this will fit the TEVO rails.

This carriage could also be used on any OpenBuilds style 20X0 V-slot rail, such as a 2020, in a vertical configuration with the carriage on top of the rail or under it. So this could