Does the Prusa i3 MK2.5S 3D printer work with SimplyPrint, OctoPrint, Mainsail and Fluidd?
Each way of connecting it, what it needs, and how to set it up.
OctoPrint
Directly, over USB
Expected to work
Prusa's 8-bit firmware on a miniRAMBo with a USB port, like the MK2.5, which prints over USB from OctoPrint.
Source
No built-in PrusaLink; Prusa's older Raspberry Pi edition of PrusaLink supported the MK2.5S, but whether the SimplyPrint Client works with it isn't known.
Ships Prusa's Marlin-based firmware. Klipper only if you install it yourself.
Source
Doesn't ship with Klipper: it runs Klipper after you install it in place of its own firmware, a modification
Prusa direct firmware
Not compatible
SimplyPrint's Prusa firmware runs only on Prusa's 32-bit Buddy printers (MINI, MK3.5, MK3.9, MK4, XL, CORE One); the MK2.5S has an 8-bit miniRAMBo.
Source
What works with SimplyPrint
Connected through OctoPrint, SimplyPrint is expected to support everything the Prusa i3 MK2.5S lets other software do: the camera and AI failure detection, remote printing, temperature and movement control and AutoPrint. 3 features depend on how it's set up: the table says what each needs.
Every SimplyPrint feature, for each way of connecting it to SimplyPrint
Connected to SimplyPrint through
SimplyPrint feature
OctoPrint
Expected to work
Monitoring
Live status and progress
Yes
Webcam
Yes1
AI failure detection
Yes1
Time left
Yes
Layer progress
Yes
Temperatures
Yes
Printing
Starting a print
Yes
Pause, resume and cancel
Yes
Skip objects
Depends2
Files
Print binary G-code (.bgcode)
Depends3
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
Automation
AutoPrint
Pro
Yes
Download the file before the print starts
Depends4
Connected to SimplyPrint through OctoPrint
Expected to work
Monitoring
Live status and progressYes
WebcamYes1
AI failure detectionYes1
Time leftYes
Layer progressYes
TemperaturesYes
Printing
Starting a printYes
Pause, resume and cancelYes
Skip objectsDepends2
Files
Print binary G-code (.bgcode)Depends3
Printer control
Change temperaturesYes
Moving with the controlsYes
HomingYes
Extrude and retractYes
Change print speedYes
Fan speedYes
Baby steppingYes
Send G-codeYes
Calibration
Change filamentYes
Bed levelingYes
Z-Offset CalibrationYes
Automation
AutoPrint ProYes
Download the file before the print startsDepends4
Works
Depends
Not supported
Needs a camera
Requires the OctoPrint plugin Cancel Objects
Requires the OctoPrint plugin BGCode
Requires version 4.2.0 or newer of the SimplyPrint plugin
What slicer to use for the Prusa i3 MK2.5S
Prusa printers use PrusaSlicer, Prusa's own slicer. There's no ready-made profile for the Prusa i3 MK2.5S in our cloud yet.
We only list slicers you can use in the SimplyPrint cloud, so there may be others for the Prusa i3 MK2.5S.
Cloud-Based Slicer for Prusa i3 MK2.5S: Use PrusaSlicer Online
Use PrusaSlicer and other slicers - directly in your browser with SimplyPrint's online cloud slicer. No installation required. Slice your Prusa i3 MK2.5S models from any device, anywhere in the world!
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 i3 MK2.5S: 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 i3 MK2.5S
Use SimplyPrint as the app for your Prusa i3 MK2.5S: watch and run it from your phone or any browser, slice in the cloud, and keep it next to your other printers. It's free to start. Prusa's own app is Prusa Connect.
There's no plate swapper or auto-ejection kit for the Prusa i3 MK2.5S in SimplyPrint yet, but AutoPrint can still keep it printing: once the plate is clear, it starts the next job from your queue.
Bed slingers are the easiest to automate
The Prusa i3 MK2.5S moves its bed back and forth, so its plate comes out to the front of the printer. That's what plate swappers like these use: they take the finished plate off and slide a fresh one on. Without a kit, a G-code routine can push cooled prints off with the toolhead.
Prusa i3 MK2.5S 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
Enclosure
Open frame
Motion system
Bed slinger
Max extruder temperature
300 °C
Has heated bed
Yes
Max bed temperature
100 °C
Number of nozzles
1
Toolheads
1
Direct drive
Yes
Probing tool / Auto Bed Leveling
Yes
Filament width
1.75 mm
Multi-material
Multi-material units it works with
Prusa MMU 2
Toolchanger or hotend changer
No
IDEX (independent dual extruders)
No
Connecting
Supports serial printing
Yes
Shipped firmware
Marlin
Files and slicing
Supported file formats
G-code (.gcode, .gco, .g)
The printer
Printer manufacturer / brand
Prusa
Printer model name
i3 MK2.5S
Made by a company from
Czechia
Launched
February 12, 2019
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 i3 MK2.5S print?
Filament compatibility for the Prusa i3 MK2.5S: 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 i3 MK2.5S
Filaments the Prusa i3 MK2.5S prints well, Prusa's own first, then the best known.
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.
Who makes the Prusa i3 MK2.5S, and how open Prusa leaves you: whether its printers run without its cloud, take any filament and slicer, and can be repaired. Each area is rated from public sources.
Openness: Open (4.9 of 5)
Open
Walled gardenOpen
Prusa Research is a Prague company founded in 2012 by Josef Průša, who came from the open-source RepRap project. It designs and builds the Original Prusa and Prusa CORE printers, makes Prusament filament, develops the PrusaSlicer slicer and runs the Printables model site. Printers are built in Prague and at its US site in Delaware, sold assembled or as kits, and used by hobbyists, schools, businesses and print farms.
Founded:
2012 ·
Headquarters:
Prague, Czech Republic ·
Ownership:
Prusa Research a.s., founded and led by Josef Průša ·
People:
More than 1,200 people (company site, 2026) ·
Website:www.prusa3d.com
Prusa is the most open of the large brands: GPL firmware, an open slicer, full local control without an account and spare parts for everything. Hardware design files now come under Prusa's own Open Community License, which allows personal and in-house business use but not selling machines.
Firmware and custom firmware ●●●●●
Firmware for current printers is published on GitHub under GPL-3.0 and updated with every release. Official firmware is signed, but Prusa documents how to flash custom firmware by breaking a seal on the board and says this does not void the warranty. Prusa says firmware and printable parts are shared right away and electronics schematics later.
[1][2][3]
Local control and integrations ●●●●●
PrusaLink, built into the CORE One, MK4S, MK3.9, MK3.5 and XL, handles monitoring, file uploads and print control on the local network without internet or an account, and printing from USB works offline. Prusa publishes PrusaLink's HTTP API as an OpenAPI specification on GitHub, and its help centre covers OctoPrint setup. Prusa Connect is an optional cloud service for remote access.
[4][15]
Third-party filament, slicers and parts ●●●●●
Printers are open to any filament; PrusaSlicer is GPL-licensed and other slicers work. Instead of a locked RFID system, Prusa created OpenPrintTag, an NFC spool-tag standard that is free for any brand to use and works offline.
[5][6]
Repairs and spare parts ●●●●●
The e-shop sells spare parts for each printer, printable parts are published, and the full CORE One CAD files are released. Prusa's open-source page says its goal is printers that stay moddable and easy to repair for decades, and its licence explicitly allows making spare parts for your own machines.
[7][3][5]
Data and privacy ●●●●●
No account is needed for local use through PrusaLink or USB. Prusa Connect needs a Prusa account and stores G-codes and telemetry in the cloud. Prusa Research is an EU company and publishes its privacy policy and a Trust Center.
[4][8]
Community and documentation ●●●●●
Large community around Printables and the forum, a detailed knowledge base, and firmware and slicer developed in public on GitHub with open issue trackers.
[1][4]
Pros
GPL firmware with a documented, warranty-safe way to flash custom firmware.
Full control on the local network through PrusaLink, with no account needed.
Spare parts for every printer, published printable parts and released CAD files.
Kits available for people who want to build and understand their printer.
Made in Prague, with a second factory in Delaware for US buyers.
OpenPrintTag is an open spool-tag standard any brand can use.
Cons
Hardware files use Prusa's own OCL licence, which bars selling machines built from them; it is not an OSI open-source licence.
Electronics schematics are published later than firmware and printable parts.
Remote access and cloud storage need Prusa Connect and an account.
Track record
July 2026: Printed Solid, the Delaware company Prusa Research bought in 2022, was renamed Prusa USA. Its Wilmington site builds the MK4S and CORE One+, makes filament and is Prusa's US service centre.
[9]
December 2025: Prusa released the full CAD files of the CORE One under its new Open Community License (OCL). OCL allows modifying, sharing mods and in-house commercial use, and grants patent and repair rights, but bars selling machines built from the files without an agreement, so it is not a standard open-source licence. Prusa said it is also filing patents on its designs.
[5]
October 2025: Prusa launched OpenPrintTag, a published NFC standard for smart filament spools that any brand can use without licence fees, starting with redesigned Prusament spools.
[6]
November 2024: Prusa announced the CORE One, its first fully enclosed CoreXY printer with active chamber temperature control.
[10]
March 2023: Josef Průša wrote that open source in 3D printing was under strain from cloners and licence violations. With the MK4, Prusa released firmware sources and models of the plastic parts but held back the electronics plans, planning to publish them later under a new licence.
[11]
Researched from 15 sources, last checked October 18, 2026. Show sources
Is the Prusa i3 MK2.5S compatible with SimplyPrint?
Most likely. We expect the Prusa i3 MK2.5S to connect to SimplyPrint via OctoPrint, but nobody has confirmed it yet. If you have one, the setup guide shows within minutes whether it works, and your answer confirms it for everyone.
How do I connect the Prusa i3 MK2.5S to SimplyPrint?
Follow our step-by-step setup guide for the Prusa i3 MK2.5S. It shows how to connect it via OctoPrint, what you need for each, and which to pick.
What slicer should I use for the Prusa i3 MK2.5S?
Use PrusaSlicer, Prusa's own slicer, made for its printers. You can run it in SimplyPrint's online slicer; there's no ready-made profile for the Prusa i3 MK2.5S in it yet.
Can I use OrcaSlicer with the Prusa i3 MK2.5S?
Yes, but OrcaSlicer has no built-in profile for the Prusa i3 MK2.5S that we know of: start from a similar printer's profile and set the bed size, height and nozzle to match.
What filament can the Prusa i3 MK2.5S print?
Based on its specs (hotend up to 300C, heated bed up to 100C), the Prusa i3 MK2.5S handles PLA, PETG, or TPU & flexibles well. See the full filament guide above for ABS, nylon, PC and composites.
Does the Prusa i3 MK2.5S work with OctoPrint or Klipper?
The Prusa i3 MK2.5S works with OctoPrint, and SimplyPrint connects to it through them - so you get cloud access, a queue and camera monitoring on top.
What is the Prusa i3 MK2.5S's bed size and build volume?
The Prusa i3 MK2.5S 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.
When did the Prusa i3 MK2.5S come out?
Prusa launched the i3 MK2.5S on February 12, 2019.
Can the Prusa i3 MK2.5S eject prints automatically?
There's no kit for it that we support yet, but SimplyPrint's AutoPrint can push prints off with the toolhead, or run your own ejection G-code, and then start the next job from your queue.
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