This my design is usefull to hold the 240mm heated bed and the 240mm glass on the Delta Kossel 3D Printer. It is composed by 6 pieces, 3 left and 3 right. They can be fixed using the original screws with T-nuts.
To lock the bed, simply center the plate and bring the supports as close together as possible. Then tighten the screws. The bed will remain locked and the glass will not turn. In this way your head can arrive near the edge of the bed without touching anything and you can use the entire area for the print.
Heated bed thickness: 3mm
Glass thickness: 3mm
The 6 pieces can be printed also in PLA (the design is so made that the head does not damage the supports). I've tested them @100°C without problems.
You can also use ABS or PETG.
Print them @50(ABS-PETG)-100%(PLA) infill.
does not care PLA, ABS,PETG
As you prefer
I suggest you to print the support with a lateral face on the bed.