This beautiful sailcar is a new STEMFIE community project designed by Brendon Collecutt. He also contributed to the STEMFIE project by coding the STEMFIE OpenSCAC library files

Brendon shared the files for this sailcar project on Thingiverse so you can make your own. As a bonus, he also designed a tool for pressing the axles into the wheels. 

In Blender, an assembled version of this mode is available to view and download from this link at SketchFab.

Cantareus STEMFIE sail project v02

STEMFIE Sailcar By Brendon Collecutt Stemfie3DCommunityProject Blender screenshot