Roller carriage stabilizer for Kossel 800

--Use the same 19mm roller as Kossel 800 carriage. Buy from here: http://item.taobao.com/item.htm?spm=a1z09.2.9.162.Y0xRcd&id=38749624507&_u=djifelu29e8
But longer (30mm) M6 screws are used.
-- Remove support structures before using.