A basic structure and mechansim Re: 3D printing, powder spreading

Graham, Ballendo,
All good thoughts and great information. I thought a bit about it and
can see how it could work. I do have one concern. How do you keep the
plaster from getting into the printing mechanism. The rotating "snow
plow" roller should put some plater into the air. I've worked with
plaster and from experience I know it goes everywhere, even without
being seriously disturbed.

Roger