Remixed the original file by Spuddy at MakerWorld to reduce the wall height on the left side, so you can still easily grip the mount handle without crippling your hand.

I assume the Celestron Nexstar Evolution Mount is the same dimensions regardless of the scope size but for reference mine is the C8 OTA

Also included a symmetrical version with the lower wall on both sides, if the mis-matched wall heights annoy you.

Either print with 5 walls or less walls with 15% infil, no supports needed.