Bean Hopper Chute Shutter Stopper Baffle for Iberital MC-2 Challenge Coffee Grinder

While the coffee grinder I use (Iberital Challenge Grinder) does a decent job of grinding coffee considering it's low price, unfortunately beans rapidly become stale when left in the hopper. For this reason, I like to put the beans back in the bag after grinding.

However, because this grinder lacks any kind of valve or shutter on the hopper, this is a difficult and messy process. I thought I would try to design and 3D print a simple shutter to close off the bottom of the hopper and make empt