Yolanda Tan, Lucas Jung
David Thompson Secondary
Floor Location : M 115 N

Plastic is so widely used for many reasons. If we cannot completely eliminate it from our lives, we can take steps to reduce the amount used and produced.

Casein is a biodegradable, environmentally friendly material that has the ability to replace plastic in many environments. 3D printing has huge potential in today’s industry, with almost infinite applications.

The objective of this project is to develop a hybrid biodegradable 3D printer filament based on casein and PETG. The final product should be flexible, strong, water-resistant, heat-resistant, and able to be extruded into filament and printed into an object in a 3D printer. A combination filament of 15% casein plastic and 85% PETG would essentially eliminate 15% of the world’s demand for oil-based plastics while also opening the door for more environmentally friendly 3D printing endeavours.

First, casein with different additives was made, including cornstarch and glycerin in varying amounts and combinations. Next, the different types of casein were tested for tensile strength using a spring scale. The extra cornstarch type of casein sustained the most weight, making it the most consistently strong casein out of all the different types.

Then, an extruder was built and the control casein and PETG were run through it to create the hybrid filament. The extra cornstarch casein was also combined with the PETG in the extruder to compare its strength to that of the control. This filament was weaker than the control.

The combination of cornstarch, casein, and PETG created a biodegradable hybrid 15% casein filament that can be used in a 3D printer. This would reduce plastic waste in the ever-evolving 3D printing industry. In the future, further experiments will be conducted to increase casein content and experiment with other materials.