I've always had problems with glass slippage on my kossels. This solves it. It clamps on the heated bed, and allows no movement of glass. Print qty 3 of these. There designed to print with the slot upwards, so no worry of support. I print mine solid. I found infill makes them want to break. There under alot of stress when you crank down the bolts. My Heated Bed: http://www.aliexpress.com/item/NEW-3-D-printer-Delta-rostock-hexagon-round-heat-bed-MK3-reference/32227244056.html?spm=2114.01020208.3.132.kJ2z7X&ws_ab_test=201407_2,201444_5,201409_5You need qty 2 M5 bolts, and qty 2 nuts per side. Total of 3 sides. Print solid, then insert bolts and nuts. Place on bed with glass in position and make sure the glass is cornered. Print in ABS, as PLA will soften at max heated bed temp.