I am using a DCAT 21 precision microelectronic balance to measure the capillary forces between water and hydrocarbons. Unfortunately, we cannot get contact angles since the petri dish holding the hydrocarbon is concave up and gets in the way of the horizontally mounted CCD camera. This device should work as a "hydrocarbon infinity pool," where liquid fills up the middle section and be spilled to the outside. The angle built into the pool section base helps to create a concave-down hydrocarbon miniscus so that the hydrocarbon stays above the PLA. Be aware that low-molecular weight hydrocarbons do dissolve small amounts of PLA, so this holder would need to be coated or printed out of a different material to be used in these applicaitons.