These are the files needed to build the food dispenser described in "A Remote Controlled Food Dispenser for Animal Research" Biomedizinische Technik/Biomedical Engineering 57(Supp 1):542-545 · September 2012 DOI: 10.1515/bmt-2012-4233 Conference: Biomedizinische Technik/Biomedical Engineering
The SolidEdge design files are included, so you can do all the modifications you want.