This is an adjustable mount to replace the original BI V2.5 acrylics ones, when you use a 310mm glass plate instead of the stock 320mm. I added some tension to the original design, only 3.25mm thickness to clear the glass plate. You should definitely use binder clips all around the bed, it keeps the glass down more firmly, also makes it easy to be leveled. I call it "big nose"!Please use ABS filament, 100% infill.