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@Execute, interesting. My design was meant for 200mm x 213mm x 3mm Borosilicate Glass and I have two of them from different vendor. I have been using these clamp since I printed it the very first time, using PLA, and still doing strong. If mine broke I'll probably print using PETG or ABS as it will withstand better heat.
Would you mind defining "break" ? was it too tight in the first place and the holding arm snap ? was the glass a bit larger than 200 x 213mm ? were you using higher temperature and the clamp melted ?
Maybe you can use other's design where they uses screws to adjust for varies size of glasses. for example : https://www.thingiverse.com/thing:1796685