Out of curiosity, would anyone know how to go about making a formicarium along the same principles as the "Mini Hearth" design that TarHeelAnts has? I love the design(s) but I've had bad experience when ordering from him. Not to mention when he messed up my order and a friends order, he had no intentions on making it right...id rather try and make them myself. I get the concept but the sand texture on the inside of them...how? Wet sand shaped instead of using clay for the chamber(s)? Fantastic design as said before but again, I'd love to make these myself...or something along the same principle.
I have seen images of someone using sand to mold the chambers before putting plaster/grout in. I don't know how it would hold during the pouring process, but it might work. I will try doing this and share images soon.