I decided to motorize my grain mill. In the process, I also decided to build a new hopper. For the last three years I have been using a hopper made from poster board (heavy paper). It has worked well, but it is time for a change. I am about half way through this build and am very happy on how it is going. Attached are a few pictures.
Laser print picture in negative and iron onto copper.
Etch in ferric chloride, 45 to 60 minutes.
Now submerge in liver of sulfur for a couple minutes.