I purchased a patty maker that didn’t fit my stuffer. I 3D printed a collar and adapter to make it work. (https://www.thingiverse.com/thing:4370508). Surprisingly enough, even printed in PLA, it’s held up pretty good.
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RE: Waltons Quick patty Maker
Just be aware of the food safety issues with anything 3D printed in contact with food. There is really no way to sterilize an FDM printed item. SLA printing might be viable, but I haven’t researched food safe resin. You might be able to 3D print and then epoxy coat to seal the print.
I printed an adapter collar for the patty maker to fit on my LEM stuffer. It holds the faces of the horn to the output of the stuffer, so isn’t in contact with food. Used it last weekend to do 40 pounds of patties. I did the as above but I vacuum seal 4 patties to a pack.