Innovative water device prototype

A common water saving tip found in various water saving guides is 'Use a bucket to collect water while waiting for the shower to get hot' A new invention called – The Cullector® - makes the use of such a medieval method redundant. Developed by Peter Cullin of Cullin Innovation, the Cullector® can be easily retro-fitted onto the existing shower outlet against the wall. The initial volume of cold water that would normally be lost to the drain is collected and then gradually reintroduced into the shower stream once the shower stream warms to the desired temperature. The device utilises proven principles of fluid dynamics to maximise the use of every last water drop. The water pressure of the shower outlet is the only power the device requires for operation.

The Cullector® device was featured on ABC's The New Inventors on 28 April 2010. The device presented on TV was a prototype fully produced by Formero.

"Formero were very understanding and supportive in my first tentative steps into the building process of the prototype, including issues such as scaling, file format, resolution and choosing the best materials for building a series of prototypes to confirm functional geometry," says Peter Cullin.

Dura Max Clear SLA was chosen for the bottle with clear lacquer on the external surface to allow the viewing of water filling and draining. The bottle was built with a wall thickness of 5mm to withstand mains water pressure. Small valves with a 2mm stem were made from Objet Tango Plus Shore A27 to allow air to enter the bottle when draining. The material was chosen to simulate the elastic properties of silicone.

The final commercial prototype mechanism was CNC milled from stainless steel . "When the mechanism arrived I was blown away by the quality of the finish including the imbedded text and the accuracy of all ten components. The mechanism assembled correctly the first time and was tested to predict flow rates" he adds.

With the help of Formero, Cullin Innovation has a high quality fully functional commercial prototype to demonstrate to potential licensees. The Cullector® is soon to be commercially available as an off-the-shelf product. On 28 April 2010, the device was chosen as best invention by the ABC’s New Inventors panellist as well as won the public vote.


Transparent bottle produced in the SLA technology


 CNC parts in stainless steel