Looks like some good and clean Resin pouder to me.

And ofc nice welding work.

I'm interested in the steel screen that you are using. What is the deal with that, is it custom made?

i have a kief box with 2 screens. I handshake it for the first screen to sift. Then the second screen I put my supersonic toothbrush on the screen. Works very well. I have been looking for a cheap small supersonic motor with no luck.

i worked in a qc lab at an asphalt plant for a few years... we would have to run all the incoming aggregate as well as our asphalt mixes through a stack of sieves.

we'd put the agg in the top sieve then set it in this box contraption that had a device on the bottom that would spin the sieve set in circles and little knockers up and down that box that would give a hard knock on the sieve set to bounce the material around.

it's funny seeing these sieve contraptions because they are pretty much the same deal - spinning around, but without the metal knockers, which really does help.