Picked up a Gimbal Lock to go with the newly acquired X5 - details to follow 
I got it from the same place I picked up the Zenmuse Z3 gimbal lock from, Aero 3D:
I’m not sure what these guys use to print their stuff but it’s a kinda rubberised plastic?
Which is ideal as it’s soft on the cameras but solid enough to hold things in place.
They’re not the cheapest but I’m a big fan of their gear 