Reading what concerns you about grinders along with other replies here and what my own needs for one in regards to testing potency demands, I've decided to take on this project of developing a new grinder or slicer.
I'm pretty much using meat grinder tech similar to the new "slicers" like Xhale and Klip. I'm not interested in a crusher style grind. I need the weed to homogenized for testing, not mauled and mutilated with resin left behind in the grinder. Pretty much trying to get a touchless effect.
Still in R&D stages now but here's where it's going with the first rough prototype....
Not too happy with this blade that came with my kit so will be using a different one when it gets here Thursday. The new style will look like a Chinese throwing star and be slightly more dangerous.
All blue plastic is food grade 3d printer filament and all steel is food grade as well but more on precautions in a bit....
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I consider kief collection in a grinder to be a useless and futile feature.
I'd rather have a grinder that doesn't keep anything so I've made the bottom collection bowl shaped and will later either adapt a stainless steel or food grade silicone bowl insert so no trich is left behind
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Meat grinder plates. Lots of options to use in regards to how fine or chunky you want the grind and they can easily be removed along with the blade for cleaning in an iso soak
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The top and Spinner for the blade are still just a drawing on my PC but will come to life at some point today. Still working on perfecting the center part with spokes so it's on it's third print and each print for that part is a little over 7 hours.
The top that will have contact with the herb will have a silicone liner between it and the herb.
Eventually as it develops, the only plastic herb will come in contact with will be the spokes and side wall which are both food grade. Every other contact point will be either food grade silicone or food grade stainless steel. I would consider the toxicity contamination to be less than that of using a sandwich baggie for carrying some weed around.