Extrusion of Resin – A New 3D Printing Technology

The developed 3D printer uses a photopolymer extrusion (PPE) printing technique that combines
the advantages of FDM and the SLA technologies. This entire 3D printing system includes the UV
curing system, an extrusion system including a pump and nozzle, a controllable 3D platform, and
UV light source. The photopolymer blend is a mix. The extrusion system consists of a pair of peristaltic pumps that are used to deliver the photopolymer blend from a reservoir to an extrusion nozzle. The UV curing system was developed by placing two UV LEDs around the extrusion head to provide sufficient curing of the extruded photopolymer and both the UV curing system and extrusion system were built on a commercial off-the-shelf FDM 3D printing platform to enable the printing process.

For a chosen material composition, the most important variables that influence the printing process
are the printing speed, extrusion factor, and UV exposure dose.

Extrusion Technology is the best for:

Modeling

Prototyping

Production applications

Printing Speed
Extrusion Factor
UV Light
The printing speed is simply the speed of the extrusion head’s movement and can be split into two parts, the infill speed and outline speed. 
The extrusion factor defines how quickly the peristaltic pumps extrude resin. The higher the extrusion factor the more the resin is extruded. In order to extrude the same amount of material at high printing speed, high extrusion factor is required and vice versa.
UV light is used for curing photopolymer resin under the same filler concentration, a high UV light intensity can result in the quicker curing of resin and prevent the watery resin spreading out on the printing plate.