3DWare.ch Handelsware Borosilicate Glass / Glass for Heated Bed 138mm x 93mm 01900610.138

If you want to make your printing platform flat enough, ideal stuff is glass sheet. Borosilicate glass is rated for higher temperatures than normal sheet glass making it a better material for use as a heated bed. After cracking a few sheets of normal glass from rapidly cooling or heating, borosilicate glass will quell your frustrations.
Size 138mm x 93mm
Glass thickness: 3mm