This paper describes an aspirating-dispensing ink-jet printer embedded in a combinatorial robot for high throughput studies in ceramics; LUSI, the London University Search Instrument. The process of reformatting well-plates from source inks and printing ceramic samples is described. Precautions against evaporation, sedimentation of colloidal suspensions, and segregation of mixtures during drying are taken to convert compositions specified in a spreadsheet into the form of ∼1 mm radius drops. It is concluded that when these precautions are taken, commercially available powders can be combinatorially mixed in LUSI to produce samples of2.4 mg to within 1–3 wt% accuracy.