https://www.educationpivot.com/post/what-i-learnt-about-injection-molding-machine-and-3d-printing-machine


Injection Molding Machine

A heated, liquified material is injected into a mold that contains a 3D “Negative of your part”. When the liquefied plastic fills the mold cavity, it takes the shape, forming your piece. Once the mold cavity has been filled, the base material is allowed to cool and re-solidify and is then ejected from the mold for inspection and distribution.

Molds from injection molding are almost custom made from steel, aluminum or other metals to fit the specifications of a particular part, and they are created in two halves so they can split apart to eject the part. In addition to the cavity with that “negative shape of your part” molds also contain hollow areas known as “runners” to convey the melted material into the cavity.

3D Printing Machine

The 3D printing process works very differently from an injection molding machine. Instead of a preformed mold to shape your part in the injection molding process, the product’s dimension shape and other physical qualities are loaded into a 3d printing machine Through CAD drawings or another compatible file. The machine then literally builds the part from the ground up. Working with thin strands of plastic substrate fed through the machine.
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https://www.educationpivot.com/post/what-i-learnt-about-injection-molding-machine-and-3d-printing-machine