Prusa i3 MK3/ua

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Prusa i3 MK3 Documentation
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Prusa i3 MK3

Release status: working

Prusa i3 MK3 is a design by Josef Prusa.
CAD Models
External Link

The Prusa i3 (iteration 3) MK3 is the newest and most current 3D Printer design by RepRap Core Developer Prusajr. The i3 MK3 incorporates lessons learned from the previous Prusa 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


Main improvements

The following is a list of the main improvements from MK2S.

  • Filament sensor
  • Power Panic
  • RPM sensing fans and Noctua fan
  • Ambient thermistor and P.I.N.D.A 2 with thermistor
  • EINSY Rambo motherboard
  • Trinamic 2130 drivers with layer shift detection, faster and silent printing
  • New robust Y axis
  • Bondtech extruder
  • Magnetic MK52 Heatbed
  • Powder coated PEI spring steel print sheet
  • Ready for OctoPrint


Offical kit available (Sep 2017)

In May 2016, the MK3 has been announced by Prusa with the phrases of "IT'S BLOODY SMART!".

Printed Parts

The STL files are available on Prusa Research.


Filament sensor

This optical filament encoder is sensing the movement of the filament. So the printer can detect not only filament outage, but also a jammed nozzle. In addition, you can use filament auto loading function with this sensor.

TMC2130 Stepper drivers

TMC2130 drivers make this printer extremely quiet with its 256 micro-stepping. Differ from the TMC2100, it can detect layer shifting, and pause the print.



Prusa i3 MK3 extruder is a perfect combination of E3D V6 hotend and Bondtech drive gears.

Heated Bed

Brand new design of MK52 makes us easier to remove the print from bed with its magnetic steel print sheet. You just need to flex the sheet.