This is a tennis ball launcher toy for dogs. Insert a 3 inch, schedule 40 PVC pipe into this design. Add a couple of motors to the top of the design. Send a tennis ball down the PVC pipe, and this will launch the tennis ball.
You may need supports for the top two parts, due to overhang. I was able to print it without supports, but I had to sand off a few pieces of hanging plastic.
Add motors to the top of the design. Screws can be used to hold it to the assembly. The motors should be wired up to spin in opposite directions.
Cut slots in the side of a 3 inch PVC pipe. They will need to be slightly larger than the height of the wheels.
Slide the PVC pipe into the completed assembly.
Turn on the motors and drop a tennis ball down the PVC pipe.
Designed in AutoDesk Inventor