MudBots has tested, and continues to test, a myriad of different mixes from standard Portland scenarios to hempcrete, clay, polyethylene, polyurethane, geopolymer and geopolycrete. While most have never heard of some of these mix solutions, they are on their way to becoming industry standards in the not so distant future. MudBots has spent most of their time printing with nothing more than standard Type S Mortar mix. The strength of Type S is about 2500 to 3000 psi which is more than enough for print jobs, but when you begin adding other attributes like hardeners, synthetic fibers, polystyrene fillers, powder adhesives, plasticizers and dies, you can significantly change the mix's characteristics.
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