Prusa i3


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Prusa i3

Release status: working

Description Prusa i3 is a design by Josef Prusa.
License GPL
Author Prusajr
Based-on Prusa i3
Categories Prusa i3, Prusa i3 Development, Prusa Mendel Development, Prusa Mendel, Mendel Variations, Cartesian-XZ-head
CAD Models none
External Link Github

The Prusa i3 (iteration 3) is the newest and most current 3D Printer design by RepRap Core Developer Prusajr. The i3 incorporates lessons learned from the previous two Prusa designs, as well as other popular modern RepRap designs. See also Prusa Mendel (iteration 2).

Infobox info icon.svg.png Derivates
The Prusa i3 is a very popular design, which led to many people creating derivates. We list these derivates in Category: Prusa i3 Derivate. Also check the Prusa i3 Variants page, as well as the Prusa i3 Development page



' Single Sheet Frame Box Frame
Plastic Parts (exc. Extruder) 26 29
Non Printed Parts approx. 337 293
Cost $300-1000? $300-$800?
Controller Electronics Almost all RepRap Almost all RepRap
Printing Size 200 x 200 x 200 200 x 200 x 270
Motors 5 x NEMA 17 Stepper 5 x NEMA 17 Stepper
Frame Material 6mm Aluminium, Wood 12mm Wood
Frame Manufacture Laser Cutter, CNC, Water Jet Basic Woodwork Tools
Pro Easy assembly Rigid XZ to Y Connection
Con Specialised Tools Looks less professional?

Main improvements

The following is a list of the main improvements made upon the Prusa Mendel Iteration 2

  • Enhanced frame rigidity (prevents x-axis backlash)
  • Easy assembly
  • Parametric files for multiple sizes/bearings or bushings


The development of the Prusa Mendel is hosted on github: