Josh Yeo built a single axis robot arm with unbelievably smooth motion, a wide array of speeds and utilities, and a built in LED.  This is the Marbl Orbit, it's affordable,  and you can order one on kickstarter this month.  Only, one problem, you have to mount to your ceiling. 

Pre Order Now - Orbit Studio  - Limited quantity 50 WWW.MARBLORBIT.COM​

BUY ONE ON KICKSTARTER -- early bird pricing 

Powered by the Brains of Axibo Technology and crafted from the eye of a cinematographer, this device is a must have for content creators. www.axibo.com