You can make a sifter out of screen. I watched an awesome video on you tube with thy guy who does the "dirtiest jobs" show. It featured a woman and her son and their meal worm business. They have a shaker machine that the screen frames fit in, but it wouldn't be hard to shake your own frame to do a bin. You could use different size screen to make a couple different frames to sift The different size worms. It was very interesting--google it--you will find it. On YouTube it was dirty jobs season 7, Episode 16. Enjoy.