Cherry Pi III Printer: Mini V Wheel Carriage for OpenBuild Extrusions (magnetic design)

The Cherry Pi III (http://www.thingiverse.com/thing:344408) started with magnetic balls as the joints. It now uses a spring-loaded string approach, which has different hole locations for the carriage mounts.
2020 extrusions from OpenBuild have deeper v-cutouts than intended with the original Cherry Pi design, so the Wheel Carriage is the wrong size for them.
This wheel carriage is for use with OpenBuild 2020 Extrusion, using the magnetic neodymium ball-mount design with the original hole pa