Build your own injection molding machine and cast the plastic parts you need.
How to Build Your Own Injection Molding Machine
The Secrets of Building a Plastic Injection Molding Machine
Custom Injection Molding, Thogus, Family-Owned High Volume, Thogus
Building a better DIY injection moulding machine part 2
Building Under Construction by RobertusMaximus
Make Your Own Injection Molding Machine
Tiny Homemade Injection Molder
What is plastic injection molding and how does it work?
DIY Injection Molding: How to Mold Plastic Parts In-House