Prusa i3 MK3 X carriage back plate with belt access

I don't understand why they made belt maintenance so hard on MK3. So I made a version that allows access to the belt clamps but is just as rigid. I started with the original Prusa design.

If you are able, you should print this upgrade *before* you first assemble your MK3. Retro-fitting will make you cry. See https://youtu.be/PZq--mrwg2w (thanks Mat1UK)

I printed versions in both ABS and PETG and they came out great. I printed with 0.35mm layer just like stock parts. I used the out-o