My latest (as of right now) prototype of the Echo. Not recommended for direct reproduction, but poke around the .step file if you want to see how it works or use parts from it. Some .stls are redundant or obselete, and version numbers are also WTF.
Video : https://www.youtube.com/watch?v=bv-HkCAhCls
Power system internals are from a Dart Zone Sentry.