Prusa
Prusa MK4
Everything you need to complete your Prusa MK4 setup
The Prusa MK4 is the gold standard of open-source FDM printing. 32-bit multi-core processor, automatic input shaping, Next-gen extruder, and first-layer calibration that works without you thinking about it — the MK4 is what other printers aspire to be. It's also built to be upgraded and tinkered with indefinitely.
What ships in the box
The MK4 ships as a kit (requires ~6 hours of assembly) or pre-assembled. Includes a 0.4mm brass nozzle, PEI spring steel sheet, a small filament spool, all tools needed for assembly, and a 3-year warranty. PrusaSlicer is free.
Filament: Prusament vs. third-party
Prusa makes their own Prusament filament with tight diameter tolerances (+/- 0.02mm) and pre-configured slicer profiles. It's excellent and worth trying — but it's also priced at a premium. Third-party PLA from Hatchbox, eSUN, or Polymaker works just as well for most applications with the generic profiles. Prusament shines for PETG, where tight diameter control prevents the ooze and stringing that budget PETG causes.
Input shaping and print speeds
The MK4 includes automatic input shaping calibration, which compensates for frame resonance at high speeds. This means you can print 200–300mm/s on the MK4 with results that would require 100mm/s on most other printers. The first run calibration sets this up automatically — don't skip it.
Multi-material with MMU3
Prusa makes the MMU3 — a 5-spool multi-material upgrade that attaches to the MK4. It's sold separately ($300+) and opens up multi-color or multi-material printing. The MMU3 requires a bit of patience to set up and tune, but once running, it's extremely capable. If multi-color printing is a goal, the MK4 + MMU3 is one of the best combinations at any price.
Nozzle upgrades
The MK4 uses the E3D V6 hotend with standard nozzles. This means a huge ecosystem of nozzle upgrades is available — from the $10 brass options to Volcano-style for faster flow to hardened steel for abrasive filaments. Prusa also sells a high-flow 0.6mm nozzle that dramatically speeds up printing of large objects with no quality loss.
Frequently asked questions
Is the Prusa MK4 worth the price?
Compared to printers at 1/3 the cost, yes — but the reasons aren't obvious. The MK4's value is in reliability over time, open-source firmware and slicer, a large community for support, first-class upgrade path (MMU3, Enclosure, etc.), and build quality that lasts for years. Budget printers often match it on day one and fall behind within 6 months.
What nozzle size should I start with?
The included 0.4mm brass nozzle is the right starting point for most use cases. It balances detail and speed well. If you want faster prints with less detail (large objects, utility parts), try 0.6mm. For fine detail (miniatures, models), 0.25mm is possible. Avoid using abrasive filaments with brass nozzles — they wear quickly.
Does the Prusa MK4 need an enclosure?
For PLA and PETG, no. Prusa makes an official enclosure for the MK4 that enables reliable ABS and ASA printing. For most hobbyists sticking to PLA/PETG, the enclosure is optional.
Should I buy the kit or pre-assembled MK4?
If you're comfortable with tools and patient, the kit saves ~$100 and teaches you the printer intimately — Prusa designs the build process to be educational. If you want to print as soon as possible without mechanical assembly, the pre-assembled version is worth the premium.
What filament brands work best with the Prusa MK4?
Prusament is the safest choice since Prusa PrusaSlicer ships with pre-tuned profiles for it. For third-party filament, Hatchbox, eSUN, and Polymaker all work excellently with the generic PLA and PETG profiles. For technical materials like PA or ABS, Prusament and Fillamentum produce more consistent results than budget brands due to tighter diameter tolerances. Avoid no-name filament — the MK4 is precise enough that cheap filament's inconsistencies become obvious.
How loud is the Prusa MK4?
The MK4 is significantly quieter than its predecessors. At standard print speeds it runs at around 40–50 dB, comparable to a quiet desk fan. The input shaping calibration reduces frame resonance that was audible on the MK3S+. It's quiet enough for overnight bedroom printing for most people, though it's not completely silent during fast travel moves.
Does the Prusa MK4 work with third-party slicers?
Yes. While PrusaSlicer (free) is optimized for the MK4 with pre-built profiles and first-class support, Orca Slicer also has excellent community-maintained MK4 profiles. Bambu Studio and Cura have MK4 profiles with varying quality. For the best out-of-box experience with the fewest settings to configure, PrusaSlicer is the recommended starting point — it integrates input shaping profiles directly.
Pro tip
Enable 'Live Adjust Z' during your first print. The MK4's display shows this option when a print starts. Twist the knob to raise or lower the nozzle in real time until the first layer is squished just slightly against the bed — it should be flat, not rounded on top. Getting the first layer right is more important than any other setting.
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