http://youtu.be/JQupBpSZ2hc Treat balls are a great way to keep your cat busy - if they'll play with them. This version is different. Since your cat can see and smell the treats it encourages it to keep playing. It also makes it easier for you to see when it needs refilling. Print out a Cage Treat Ball for Cats and watch your frisky feline friend go wild! Note: Item not tested for safety. Use at your own risk.You can print each side separately or both at once. The version shown was printed in ABS, but PLA should work too. It was printed without supports, though I did run into trouble once doing it that way. Printing both halves at the same time would likely resolve the issue and also make the print neater as each layer has more time to cool. Once printed, use plastic model cement to glue them together. The exit holes were designed for Temptations Tumblers cat treats, but any 8mm(ish) treat will work. Cat Training My cat first sniffed it, then picked it up in her teeth, dropped it, then gave me a "THE TREATS ARE IN A CAGE - ARE YOU KIDDING ME!!!" death stare and walked away. I left the ball out overnight and by morning the treats were gone. She now happily gets them out by pushing it around with her face. I still get dirty looks though.