This holder fits any Kossel mini Delta printer with 2020 extrusion and a heated aluminium bed size of 219mm diameter and 3.2mm thick. A wide range of glass plate can be incorporated. Mine is 196mm diameter. The holder allows the aluminium heated bed and glass build plate to be held firmly. It also allows the removal of the assembly without taking it apart for access to the electronics below by use of an aligned hole for the screw. Three sets are required to fit the 2020 extrusion.
I used 2off domed bolts 4x12mm and a 4mm slotted T nut for each holder (x3 for complete set) . Sizes can be adjusted for different heated bed heights. As the glass bed is held at the side only, no adjustment is needed. ABS or any high temperature filament is preferred as it is in direct contact with the heated bed.