Industrial Fixtures/ Doors/ Hatches for War Gaming Boards

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

I printed them at .3mm resolution which worked out just fine since I ended up weathering them to make them seem rusty and more incorperated into the board.

Also the game board was made from a sheet of Blue Insulation foam cut into 2' x 2' squares that was painted with elmers glue, dusted with sand, painted black, then dry brushed.