These OpenSCAD files add configurable right triangles and isosceles triangles to the PolyPanel universe. Note that you can cofigure the opening direction of each hinge. In order to get them to fold nicely in a so-called "Magic Ball" fold as pictured, you need to orient all of the diagonal edges the opposite direction from the horizontal and vertical edges. NOTE: if you do this, the pieces can no longer be printed without support.
These OpenSCAD files also allow you to configure the basic edge length to a value different than the system-standard 45mm. NOTE: doing so produces files that are incompatible with standard PolyPanels. Note also that the attached STL files, which produce the pictured pieces, have been modified in this way and are NOT system-compatible.