The production of purified macromolecular samples can be very challenging. Subsequently it is hard to schedule exactly when the final sample preparation will be obtained. Samples produced at the LMB can be screened anytime for crystallisation because crystallisation trays filled up with with a broad variety of initial screens (LMB screens) are made readily available to users of the crystallisation facility. A fully automated pipetting system prepares the LMB screens, as seen here on day 285 of #LMB365.