Simple plunger design for paste extruder for ceramic 3D printer

Pretty simple design, not so sure how much more a stepper with threaded rod going thru the shaft is thought.  Its definitely not a common stepper motor to come across.

http://www.3ders.org/articles/20181121-how-to-build-a-plunger-style-paste-extruder-for-ceramic-3d-printer-step-by-step-diy-guide.html

 

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