Servos

RepRap 3d-printer axes are often stepper motor driven. Modern proprietary 2d-printers almost always use servos (DC motor + encoder) instead. Servo-based drives are often lighter and cheaper as well as featuring closed loop control.

Sources

• State-of-the-art RepRap servo usage video, 2016
• Code used in video, 2016
• Blog on Arduino PID library for 3d-printer, 2015
• RepRap forums, a worked servo example, 2007
• RepRap Wiki on Motor Control Loop
• RepRapServo 1.0 active before, 2012
• RepRap Wiki GearMotorStepper
• RepRap Motor FAQ
• Open Servo. Active before 2012.
• Open Encoder
• MyToyRep experiments with DC motor usage on all axes
• This large forum thread is large but walks through much of RepRap's current DC servo knowledge, 2016
• Nophead's extruder tweaks mentions DC motor usage for extruders, 2010