The additional ventilation is necessary for longer prints with PETG or ASA, as it gets very warm in the original prusa enclosure. To minimize dust in the enclosure, the ventilation grilles can accommodate a fine filter mat.
The drilling template can be used to mark out the cutouts in the plexiglass and the filter mats.
The author remixed this model.
The handles were used as templates for the ventilation grilles for the prusa enclosure