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Prusa i3 Documentation
Crystal Clear action run.png
Prusa i3

Release status: working

Prusa i3 is a redesign by Prusajr.
CAD Models
External Link


The Prusa i3 (iteration 3) is the newest and 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).


' 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 backlash)
  • Easy assembly
  • Parametric files for multiple sizes/bearings or bushings



Printed Parts

The STL files to make the printer can be found at Clone_wars:_Prusa_iteración_3. and here zipped up: Please note that the zipped files are not compatible with holes for the Z axis brackets in the Prusa3ALU-*.dxf drawings, at least the ones in the old/ folder in github. Also, the models for Y-axis brackets are for M8 rods. Compiling your own and investigating the Prusa github packages is highly recommended!

RP every .scad in this directory (except complete-printer) once. Aim for 0.3mm layers and 2.2 extrusion width (width over thickness), for 0.66mm stroke width. Printer is tested at this setting.

Using doc/complete-printer.scad as a visual clue and doc/manual.txt as a guide, build the printer.

Frame type

Single Sheet Frame

This is a frame created from a single sheet of metal, typically Aluminum, but can also be made from various Materials with a thickness greater than 6mm / 0.25 inch

Prusa i3 with a single metal sheet style frame.
Prusa i3 with a single metal sheet style frame.


- Looks professional (subjective)


- Requires specialised tools (e.g. Water flow jet cutter)

- Less rigid connection between XZ-frame and Y-frame part, however this can be somewhat rectified by the TwelvePro variant, which provides additional frame support.

Wood Sheet frame

Wood Style Sheet Frame
Wood Style Sheet Frame
Wood Style Sheet Frame Made Out Of Melamime
Wood Style Sheet Frame Made Out Of Melamime

This is a version of the sheet frame that is designed to be laser cut out of wood or plastic (eg. acrylic) if you don't have access to a waterjet cutter. The only difference is that this version has support gussets on the back side of the vertical frame (the side that doesn't have the z threaded rods).

Construction is the same.


- Looks professional (subjective)


- Requires specialized tools (e.g.laser cutter)

- Less rigid connection between XZ-frame and Y-frame part (Connects in the same way as the alu sheet frame)


Stepper Motors

Controller Electronics