There may be some prior art here: https://patents.google.com/patent/CN203310960U/en?q=feces&q=simulator https://patents.google.com/patent/CN203310960U/en?q=fec

There may be some prior art here: https://patents.google.com/patent/CN203310960U/en?q=feces&q=simulator https://patents.google.com/patent/CN203310960U/en?q=feces&q=...