This design is optimized for print speed without any disadvantages over the original RC3.
Other remixes similar to this I've tried have an issue where the thickness of the walls is just enough to leave a small gap and easily snaps apart when flexed. This design uses chamfers in such a way that this issue is 100% mitigated. With my setting I can print 2 Rc3 in 1hr 45min.
The author remixed this model.