https://techcrunch.com/2018/07/27/nasas-3d-printed-mars-habitat-competition-doles-out-prizes-to-concept-habs/

A multi-year NASA contest to design a 3D-printable Mars habitat using on-planet materials has just hit another milestone — and a handful of teams have taken home some cold hard cash. This more laid-back phase had contestants designing their proposed habitat using architectural tools, with the five winners set to build scale models next year.

Technically this is the first phase of the third phase — the (actual) second phase took place last year and teams took home quite a bit of money.