A three dimensional printing system includes a vertical support (4), a support plate (10), a resin vessel (20), a resin handling module (150), a latch (152), and an interface mechanism (60). The support plate has a proximal end affixed to the vertical support and extends along a first lateral axis to a distal end. The resin vessel is supported by the support plate and includes a vessel body (82) and a transparent sheet (55). The vessel body has a latch feature (92) formed therein. The resin handling module includes a fluid outlet (30) for dispensing resin into the resin vessel. The interface mechanism is configured to move the latch into engagement with the latch feature and to move the resin handling module from a non-operating position to an operating position whereby the fluid outlet is operably positioned over a portion of the resin vessel.