16 pieces flat cube puzzle

A puzzle of 16 pieces. The goal is to assemble the pieces and make a completely flat surface like a chess board. The original print profile use 3 plates, one for the box and 2 for the pieces places to avoid support at the maximum. 2 pieces have one small support. Boost MeA boost or a like is always welcome :-) PS : I don't put the solution here (that's the purpose of a brain challenge :-) ), but if needed i can give some hints.