Sadly the creation of a steel burr and ring was beyond his 3D-printing capabilities ... for a coffee grinder, for example, or a tea-light-powered filter coffee machine for power cut beverage ...

Instead of lapping the blank by hand, Laurie Hall built this mirror grinding machine from scratch. His site has notes covering his mirror creation machines and other projects.

In the grinding module, the wafers move from rough grinding to finish grinding as the index table rotates. To improve the performance of semiconductor circuits, “3D packaging technology ...