Enrichment Feeding Tube for Pet Rat, Mouse, etc. Foraging Toy

I've always been an advocate about giving as much enrichment as possible to our pets, and we had saved these rats from a lab but they didn't have much stuff to play with nor was I able to find a lot of enrichment toys for them online. 
I decided I'd design a tube in which you put food and kibble, then put it in the cage so they can play with and forage. 

My rats really loved it, I hope yours will also do!

STL was designed so that printing shouldn't require any supports. 
Screw cap is designed with a 0.2 tolerance. May be a tight fit on some printers, did well on mine. 
Let me know if you have issues, I'll correct them as fast as I can.