Prusa i3
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Release status: working
Description | Prusa i3 is a redesign by Prusajr.
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Contents
Introduction
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 RepRaps designs.
Main improvements
The following is a list of the main improvements made on the Prusa mendel iteration 2
- enhanced frame rigidity (prevents x backlash)
- easy assembly
- parametric files for multiple sizes/bearings or bushings
Development
The development of the Prusa Mendel is hosted on github: https://github.com/josefprusa/Prusa3.
History
Printed Parts
The STL files to make the printer can be found at Clone_wars:_Prusa_iteración_3.
To compile yourselve use the files from Github [[2]] (box style files) [[3]] (Singel sheet style) Copy configuration.scad.dist to configuration.scad and fill custom settings section there
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
The Prusa i3 frame consists of a threaded rod Y-axis that looks similar to mendel type frames and a other material vertical frame part for the X-axis and Z-axis. A single sheet frame can be made from metal or a box style frame can be made from wood.
Single Sheet Frame
This is a frame created from a single sheet of metal (for example aluminum)
pro:
- Looks professional (subjective)
con:
- requires specialised tools (e.g. Water flow jet cutter)
- Less rigid connection between XZ-frame and Y-frame part
Box Style Frame
This frame is created created from 8 small sheets of wood.
pro:
- Can be created with standard DIY tools
- More rigid connection between XZ-frame and Y-frame part
con:
- Looks less professional (subjective)
Electronics
Stepper Motors
The Prusa i3 uses, including the extruder, 5 NEMA17 stepper motors. Two of these motors, the Z axis motors, are connected to the same stepper driver of the electronics. If using Wade's Extruder, its stepper motor needs a minimum holding torque of 40Ncm (0.4Nm). More information can be found on the Stepper Motor page.
Controller Electronics
About any RepRap controller works for the Prusa i3. Required features: 4 stepper drivers, 1 thermistor input and 1 heater output for the extruder and optionally another thermistor/heater pair for the heated bed. Choosing the best one for your printer is mostly a matter of taste. For comparisons, see List of electronics, Comparison of Electronics and Alternative Electronics.
Extruder
On November 12th, 2012 Josef Prusa (@josefprusa) tweeted a picture of his metal frame i3 with a custom dual extruder mounted.
//Need name, info, and link to this extruder and how to build it. Can anyone help? -idolcrasher
Previous posts on Prusa's twitter feed reveal that Sound (Slic3r's Developer) inspired Prusa to attach a dual extruder.