In the second half of 2019, we successfully solved the project "Rapid iterative generation of large optical elements". The project was supported by the Subsidy Fund of the Liberec Region. As part of the project, the production of large convex and concave surfaces from a glass substrate was verified. Several geometries of increasing complexity were tested during the project. The R500 concave lens geometry created in a 340x340x40 mm glass block was selected as a technology demonstrator. A working sample of this lens has been created. This geometry was chosen after consultation with the customer (TOPTEC ÚFP AS ČR) as a complicated case of a large order, when it is necessary to quickly remove a large amount of material with sufficient accuracy during processing. Required maximum deviation from the prescribed shape 0.1 mm (ie radius R=500 mm ±2% and deviation from the spherical shape in this tolerance less than 0.1 mm). In this way, the customer obtains an ideal input blank for subsequent lapping and precise polishing.