I started a small mealworm farm and purchased a set of bucket sifters (https://tinyurl.com/bucketsifter?fbclid=IwAR0Uw73IPfx9fJIBmN-wD2YZzoLlDZ18NC5Brui9aPmkMu4sZsKt_lEZRY0). They work good but the worms don't fall through the screen holes as well as they do slots. After purchasing a Pupae sifter insert from here (https://www.spacecoastmealworms.com/collections/mealworm-pupae-sifting-trays?fbclid=IwAR2tBWLnFxRK8LMWsoHI54aB7YwIJhNpfspm_S96VlwJ6hxbFiD_KQ0wWNM) I realized the slots are the way to go and as this was the only size being sold from this person I decide to fill the gap with my own inserts for the other sizes. I will not be making one with the same slot size as the link above, It works great for pupae and you can get one from him. But I will be adding other sizes for sorting mealworms by size. To start here is the 2.5mm slot one that is good for sorting medium sized and larger mealworms.

Edited: added 1.5mm, 2.0mm and 3.0mm slot widths Edit: added same sizes as whole inserts for those with large enough print beds. Diameter is 276mm Edit: 11-28-21 added Whole inserts V2 173mm diameter fits a bit better