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Prusa MK3.9: specs, SimplyPrint compatibility and setup

By Prusa, Czechia

Prusa MK3.9 image

Does it work with SimplyPrint?

Compatible We're sure

It's known to work with SimplyPrint, from documentation, the protocol or owners' prints.

Connects with: SimplyPrint Client Klipper (Moonraker) OctoPrint Prusa direct firmware
Set it up Compare

Prusa MK3.9 at a glance

The Prusa MK3.9 is a 3D printer by Prusa with a 250 x 210 x 210 mm build volume.

Build volume
250 x 210 x 210 mm
Prints well
PLA, PETG, TPU & flexibles
All specifications

Connect the Prusa MK3.9 to SimplyPrint

Does the Prusa MK3.9 3D printer work with SimplyPrint, OctoPrint, Mainsail and Fluidd? Each way of connecting it, what it needs, and how to set it up.

What works with SimplyPrint

Connected through Klipper (Moonraker), SimplyPrint supports most of what it offers on the Prusa MK3.9: the camera and AI failure detection, remote printing, skipping objects, temperature and movement control and AutoPrint. Not yet in SimplyPrint through Klipper (Moonraker): download the file before the print starts. Not available through Klipper (Moonraker): print binary G-code (.bgcode) and sync loaded filament from the multi-material unit. The table below compares all 4 ways of connecting it to SimplyPrint.

Every SimplyPrint feature, for each way of connecting it to SimplyPrint
Connected to SimplyPrint through
SimplyPrint feature SimplyPrint Client Compatible Klipper (Moonraker) Compatible OctoPrint Compatible Prusa direct firmware Compatible
Monitoring
Live status and progress Yes Yes Yes Yes
Webcam Yes 1 Yes 1 Yes 1 Not offered by the printer 2
AI failure detection Yes 1 Yes 1 Yes 1 Not offered by the printer 2
Time left Yes Yes Yes Yes
Layer progress Not offered by the printer 2 Yes Yes Yes
Temperatures Yes Yes Yes Yes
Printing
Starting a print Yes Yes Yes Yes
Pause, resume and cancel Yes Yes Yes Yes
Skip objects Not offered by the printer 2 Yes Depends 3 Yes
Files
Print binary G-code (.bgcode) Yes No Depends 4 Depends 5
Printer control
Change temperatures Not offered by the printer 2 Yes Yes Yes
Moving with the controls Not offered by the printer 2 Yes Yes Yes
Homing Not offered by the printer 2 Yes Yes Yes
Extrude and retract Not offered by the printer 2 Yes Yes Yes
Change print speed Not offered by the printer 2 Yes Yes Yes
Fan speed Not offered by the printer 2 Yes Yes Yes
Baby stepping Not offered by the printer 2 Yes Yes Yes
Send G-code Not offered by the printer 2 Yes Yes Yes
Calibration
Change filament Not offered by the printer 2 Yes Yes Yes
Bed leveling Not offered by the printer 2 Yes Yes Yes
Z-Offset Calibration Not offered by the printer 2 Yes Yes No
Multi-material
Sync loaded filament from the multi-material unit No No No Yes 6
Automation
AutoPrint Pro Yes Yes Yes Yes
Download the file before the print starts Not offered by the printer 2 No 7 Depends 8 Yes

Connected to SimplyPrint through SimplyPrint Client

Compatible

Monitoring

  • Live status and progress Yes
  • Webcam Yes 1
  • AI failure detection Yes 1
  • Time left Yes
  • Layer progress Not offered by the printer 2
  • Temperatures Yes

Printing

  • Starting a print Yes
  • Pause, resume and cancel Yes
  • Skip objects Not offered by the printer 2

Files

  • Print binary G-code (.bgcode) Yes

Printer control

  • Change temperatures Not offered by the printer 2
  • Moving with the controls Not offered by the printer 2
  • Homing Not offered by the printer 2
  • Extrude and retract Not offered by the printer 2
  • Change print speed Not offered by the printer 2
  • Fan speed Not offered by the printer 2
  • Baby stepping Not offered by the printer 2
  • Send G-code Not offered by the printer 2

Calibration

  • Change filament Not offered by the printer 2
  • Bed leveling Not offered by the printer 2
  • Z-Offset Calibration Not offered by the printer 2

Multi-material

  • Sync loaded filament from the multi-material unit No

Automation

  • AutoPrint Pro Yes
  • Download the file before the print starts Not offered by the printer 2

Connected to SimplyPrint through Klipper (Moonraker)

Compatible

Monitoring

  • Live status and progress Yes
  • Webcam Yes 1
  • AI failure detection Yes 1
  • Time left Yes
  • Layer progress Yes
  • Temperatures Yes

Printing

  • Starting a print Yes
  • Pause, resume and cancel Yes
  • Skip objects Yes

Files

  • Print binary G-code (.bgcode) No

Printer control

  • Change temperatures Yes
  • Moving with the controls Yes
  • Homing Yes
  • Extrude and retract Yes
  • Change print speed Yes
  • Fan speed Yes
  • Baby stepping Yes
  • Send G-code Yes

Calibration

  • Change filament Yes
  • Bed leveling Yes
  • Z-Offset Calibration Yes

Multi-material

  • Sync loaded filament from the multi-material unit No

Automation

  • AutoPrint Pro Yes
  • Download the file before the print starts No 7

Connected to SimplyPrint through OctoPrint

Compatible

Monitoring

  • Live status and progress Yes
  • Webcam Yes 1
  • AI failure detection Yes 1
  • Time left Yes
  • Layer progress Yes
  • Temperatures Yes

Printing

  • Starting a print Yes
  • Pause, resume and cancel Yes
  • Skip objects Depends 3

Files

  • Print binary G-code (.bgcode) Depends 4

Printer control

  • Change temperatures Yes
  • Moving with the controls Yes
  • Homing Yes
  • Extrude and retract Yes
  • Change print speed Yes
  • Fan speed Yes
  • Baby stepping Yes
  • Send G-code Yes

Calibration

  • Change filament Yes
  • Bed leveling Yes
  • Z-Offset Calibration Yes

Multi-material

  • Sync loaded filament from the multi-material unit No

Automation

  • AutoPrint Pro Yes
  • Download the file before the print starts Depends 8

Connected to SimplyPrint through Prusa direct firmware

Compatible

Monitoring

  • Live status and progress Yes
  • Webcam Not offered by the printer 2
  • AI failure detection Not offered by the printer 2
  • Time left Yes
  • Layer progress Yes
  • Temperatures Yes

Printing

  • Starting a print Yes
  • Pause, resume and cancel Yes
  • Skip objects Yes

Files

  • Print binary G-code (.bgcode) Depends 5

Printer control

  • Change temperatures Yes
  • Moving with the controls Yes
  • Homing Yes
  • Extrude and retract Yes
  • Change print speed Yes
  • Fan speed Yes
  • Baby stepping Yes
  • Send G-code Yes

Calibration

  • Change filament Yes
  • Bed leveling Yes
  • Z-Offset Calibration No

Multi-material

  • Sync loaded filament from the multi-material unit Yes 6

Automation

  • AutoPrint Pro Yes
  • Download the file before the print starts Yes

Works Depends Not supported Not offered by the printer

  1. Needs a camera
  2. The printer doesn't offer this to other software.
  3. Requires the OctoPrint plugin Cancel Objects
  4. Requires the OctoPrint plugin BGCode
  5. Requires firmware 5.2.0 or newer
  6. Needs a multi-material unit
  7. SimplyPrint doesn't support this through this connection yet.
  8. Requires version 4.2.0 or newer of the SimplyPrint plugin

What slicer to use for the Prusa MK3.9

Use PrusaSlicer, Prusa's own slicer: it has a ready-made profile for the Prusa MK3.9. Also with a profile for it: OrcaSlicer, ElegooSlicer, CrealityPrint.

Ready-made profile for the Prusa MK3.9

No profile for the Prusa MK3.9

We only list slicers you can use in the SimplyPrint cloud, so there may be others for the Prusa MK3.9.

Cloud-Based Slicer for Prusa MK3.9: Use PrusaSlicer Online

Use PrusaSlicer and other slicers - directly in your browser with SimplyPrint's online cloud slicer. No installation required. Slice your Prusa MK3.9 models from any device, anywhere in the world!

Try Online Slicer Now
Profiles and other slicers

Automatic Profile Updates: Profiles are automatically checked and fetched from the slicer GitHub repositories every day, as well as from our own open-source community-driven slicer profile database. This ensures you always have access to the latest profiles.

Note: Other slicers, such as Simplify3D, ideaMaker, SuperSlicer and KISSlicer, aren't in our cloud, so we don't track their profiles. They may still work well with your Prusa MK3.9: check the slicer's own documentation or forums for a profile. You can also contribute profiles to our open-source slicer profile database on GitHub.

The app for the Prusa MK3.9

SimplyPrint works as the Prusa MK3.9's app: on your phone and in any browser, with a slicer in the cloud.

What you get with SimplyPrint

  • An app for iPhone and Android, the same in any browser, and a slicer in the cloud.
  • More than monitoring: a print queue, AI failure detection, AutoPrint and accounts for a team.
  • Printers from many brands in one place, side by side.
  • A European cloud: hosted in Frankfurt, Germany, under the GDPR.
Connect the Prusa MK3.9 to SimplyPrint, free Download SimplyPrint on the App Store Get SimplyPrint on Google Play

Running several Prusa printers? See SimplyPrint's print farm software for Prusa.

Automate the Prusa MK3.9

There's no plate swapper or auto-ejection kit for the Prusa MK3.9 in SimplyPrint yet, but AutoPrint can still keep it printing: once the plate is clear, it starts the next job from your queue.

Ways to automate it

How AutoPrint works

AutoPrint comes with the Pro plan and up.

Prusa MK3.9 specifications: bed size, print height and more

Its size, temperatures, multi-material and how it connects, from the maker and our own research.

Size

Build volume 250 x 210 x 210 mm
Bed type Rectangle
Bed size 250 x 210 mm
Max print height 210 mm

Printing

Max extruder temperature 300 °C
Has heated bed Yes
Max bed temperature 120 °C
Number of nozzles 1
Direct drive Yes
Probing tool / Auto Bed Leveling Yes
Filament width 1.75 mm

Connecting

Supports serial printing Yes
Shipped firmware Marlin

Files and slicing

Supported file formats G-code (.gcode, .gco, .g) Special formats: bgcode
Slicer profile name(s) MK4IS, MK4, Prusa MK4

The printer

Printer manufacturer / brand Prusa
Printer model name MK3.9
Made by a company from Czechia

Disclaimer: We strive to keep this information as current and accurate as possible, but cannot guarantee its completeness or reliability. Our data is based on user submissions and manufacturer references.

What filament can the Prusa MK3.9 print?

Filament compatibility for the Prusa MK3.9: the materials it can handle, judged from its hotend, bed, chamber and enclosure.

Filament Suitability Notes
PLA Great The easiest filament to print. Works on almost any printer; a heated bed helps adhesion but is not required.
PETG Great Comfortably in range (PETG likes a ~230-250C hotend and a ~70-85C bed).
TPU & flexibles Great The direct-drive extruder feeds flexible filament well. Print slowly for clean results.
ABS & ASA With care The bed is hot enough, but ABS and ASA warp without an enclosure, which is strongly recommended for clean prints.
Nylon (PA) With care Possible with care - an enclosure and very dry filament are essential.
Polycarbonate (PC) With care On the edge - PC really wants an enclosed, hot chamber to avoid warping.
Carbon-fiber & glass-filled With care Possible if you fit a hardened or wear-resistant nozzle - the abrasive fibers quickly wear a stock brass nozzle.

Tip: this is a general guide from the printer's specs - always check your filament's recommended settings. With SimplyPrint you can save a profile for each spool and track exactly what filament you have in stock.

Best filament for the Prusa MK3.9

Filaments the Prusa MK3.9 prints well, Prusa's own first, then the best known.

Find filament for the Prusa MK3.9 All 3D printer filaments

Compare the Prusa MK3.9 with similar printers

Printers from the same maker, of a similar size, printing the same engineering materials or multi-material like it, that you can buy today. Compare up to four side by side, with their specs and how each connects.

Compare the Prusa MK3.9 with other printers All Prusa printers

Frequently asked questions

Is the Prusa MK3.9 compatible with SimplyPrint?

Yes. You can connect the Prusa MK3.9 to SimplyPrint via SimplyPrint Client, Klipper (Moonraker), OctoPrint, or Prusa direct firmware, then slice, queue, start and monitor prints from your browser or the mobile app.

How do I connect the Prusa MK3.9 to SimplyPrint?

Follow our step-by-step setup guide for the Prusa MK3.9. It shows how to connect it via SimplyPrint Client, Klipper (Moonraker), OctoPrint, or Prusa direct firmware, what you need for each, and which to pick.

What slicer should I use for the Prusa MK3.9?

We recommend PrusaSlicer for the Prusa MK3.9. You can run it, and 6 other slicers, directly in SimplyPrint's online slicer - no install, on any device, with profiles for the Prusa MK3.9 kept up to date automatically.

Can I use OrcaSlicer with the Prusa MK3.9?

Yes. OrcaSlicer comes with a profile for the Prusa MK3.9, and you can run it in SimplyPrint's online slicer, so there's nothing to install.

What filament can the Prusa MK3.9 print?

Based on its specs (hotend up to 300C, heated bed up to 120C), the Prusa MK3.9 handles PLA, PETG, or TPU & flexibles well. See the full filament guide above for ABS, nylon, PC and composites.

Does the Prusa MK3.9 work with OctoPrint or Klipper?

The Prusa MK3.9 works with OctoPrint or Klipper (Mainsail and Fluidd), and SimplyPrint connects to it through them - so you get cloud access, a queue and camera monitoring on top.

What is the Prusa MK3.9's bed size and build volume?

The Prusa MK3.9 has a 250 x 210 mm print bed and prints up to 210 mm tall, a build volume of about 250 x 210 x 210 mm. See the full specifications table above for bed type, temperatures and more.

Can the Prusa MK3.9 eject prints automatically?

There's no kit for it that we support yet, but SimplyPrint's AutoPrint can run your own ejection G-code, work with a robot arm through the API, or wait for you to clear the plate, and then start the next job from your queue.

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