A novel capillary liquid-metal-ion-source (LMIS) was developed that operates in the same flow resistance regime as the previously reported smooth needle-type LMIS. This new LMIS has the advantage that the flow resistance can actually be mechanically designed. Moreover, the operation of this type of source promises better stability during long-term operation compared with needle-type sources. The experimental results obtained agree well with analytical models from Mair.