I scaled Zinput's case to eliminate the loose fit they mentioned in the original description. 

Warning: I printed this in Bambulab's TPU for AMS. This has a hardness of 68D, which is noticeably harder than the typical 95A of most TPUs.  I also have the Crystal edition of the Nomad. While it should have the same dimensions as the normal Nomad, I cannot confirm this, so further scaling might be needed to get the perfect fit.