This Bumble Bear Compact 45 was built to further refine the way the film reels are kept parallel.
The winder inserted into it keeps the top of the film reel from wandering, but with my cardboard cameras the bottom tends to twist outward and backward when pulling the film. Most cameras have some kind of clip or axle at the bottom. I tried this with the original Evil Cube but I kept losing the small parts that did that. In the Evil Cube template there's a double layer of cardstock, the same width as the flange on a 120 reel that stops the bottom from moving. Spacers added to the top make sure the reel stays down against it. This was a really simple, easy to make solution but once or twice it failed so I started looking for a better method.