Oh I forgot to mention. If the wood that was used in this machine was made with anything but just plain heat treated wood. Any glue, pesticides, fungicides, or materials used in processing the wood. Will also leach out into the food when it is heated up. So there is that too which needs to be strongly considered. 

Overall I applaud you on your idea. Now please, I'm begging you, retire it. Stop processing your food immediately and get it tested. For chemicals and heavy metal toxicity. 

You might even be able to genuinely ask the nostr community for help via zaps. That can pay for lab testing, or a food safe dehydrateor. If you need help.  

 What do you think would absorb the most contaminants? Something wet and gooey? I did some aloe vera a while back. There is a lab not far from my house and I get food tested there from time to time along with my water. While the tests aren't cheap, they aren't expensive either, I think it would be interesting to bring something in and see what's there. I know they can test for heavy metals, I wonder about bpas. I guess I could just describe what I'm doing and see what there recommend to test for.  

 Hair/fur 

 Are you suggesting I put fur in the dehydrator for a couple days and get it tested?  

 I have clearly misread you. Beg pardon; nothing would be more repellent.