Any idea how I could use a similar process to print glue? I would like to print glue in very specific places on a page so I can run sand over it and make a sand portrait.
Print a negative and use it like a stencil. You could also mix acrylic with sand so you can exclude the glue part altogether
Thanks, but I'm trying to automate the process for mass production.
Not OP, but curious why stencil is not a viable option for mass production? You don't have to roll compound over the stencil manually. Stencils are still used in applications like solder paste.
Well I'm not trying to reproduce the same picture 100 times but instead 100 different pictures. So it would be 100 different stencils.
Yes stencil or screen printing is much faster for mass production. It is faster and you could directly print on a variety of substrates like FR4, plastic, glass and even paper. I'll wirte about that next
You could modify a 3D printer to output glue instead of plastic, a slightly related video I can provide shows how you can print chocolate on to a piece of break[0].