See the original model for instructions how to print and mount: Transport handle for Original Prusa Enclosure by Prusa Research | Download free STL model | Printables.com
The author remixed this model.
The only difference in this remix, is a small opening for the Raspberry Pi Camera ribbon cable. I have Pi Cam inside the enclosure and Raspberry Pi on Multiboard outside the enclosure, so the cable must go through the enclosure somewhere. Figured the transport handle was a good location.