Vibration dampener and slack tensioner for rostock max arms.
I cad'ed this out in Alibre and put it into an STL. I used a 1/8"x3/8" dowel pin and then 3 - 6.5x22mm springs that pull together with loops. I manually drilled out the dowel pin holes with a standard 1/8" drill bit but there is enough material for you to use whatever you want to secure the springs. This file doesn't have any holes and can be customized as you like.
I printed these with full infill and they clip on and hold great to the rostock max platform arms.