3DWare.ch Handelsware Borosilicate Glass / Glass for Heated Bed 235mm x 155mm 01900610.235

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 235mm x 155mm
Glass thickness: 3mm