About this 3D model

I have created three different simple easy to print industrial themed pieces to add to any war gaming board. I specifically play Necromunda, but they will really work on any game board. I wanted to make the board we play on detailed and eciting to look at without having any structures permanently attached that would get in the way of models/ other terrain. I have created three different models, two which are pictured above: -Blast doors -Sewage Grate -Round floor hatch