Snug fit Ender 2 Pro rail covers

A simple but effective modification to the rail covers by James___UK; this version uses less material, and fits more firmly, by chopping out the inside, and using thin walls that widen towards the ends to be wider than the slots they fit in. 

Any mildly flexible filament should be able to work with this, and fit snug without rattling around. (As an example, I printed mine with wood PLA, which is stiffer than regular PLA).

Please note that this model has a very thin base, and thin walls. I was able to successfully print mine with a 0.6mm nozzle, but something finer may work better. I'd recommend not using a brim or anything like that, since it may be hard to peel off without damaging the thin base. Once printed, try putting one end/corner in first, guiding the sides so they flex inwards and can fit into the rails. Then, they should hold themselves snug.