Summary Sandbag (bunker terrain); work in progress I use old CD or DVDs as starting bases for object markers and terrain elements; 116mm in diameter, can be removed if you don't need it but it gives the underside of these sandbags something to build up from without support elements; I think I have a stack of 200+ old AOL CDs still left in my stash - lol. This thing was made with Tinkercad. Edit it online https://tinkercad.com/things/6ai5H5AwNV4