The Epson Moverio BT-300 controller will securely snap into these cradles. Two iterations, the longer version protects the cable attachment in the back of the Epson controller. I suspect this may be a point of cable breaks if you use a strap around the neck to keep the controller level. The short version is more compact otherwise the same. Designed so that you can leave all assembled and switch the BT-300 controller easily on and off. I printed this in PETG. ABS should be fine but PLA is probably not flexible enough. Enjoy Life. There is now a case for this with the two controllers attached. http://www.youmagine.com/designs/dji-mavic-pro-and-epson-bt300-controller-cases.