3D Printed Fittings
A 3D printed parts manufacturing Enterprise can be developed with OSE Clubs. The advantage is the ability to recycle.
Common PVC fittings, Formufit, or quadruple PVC frames (https://3dprint.com/84284/pvc-pipe-construction-kit/) may be productized.
In a more advanced version, they may be turned to toy kits - such as kits with working bydraulic 3d printed/PVC cylinders.