Completed core reference · Prusa Research

MK4 Printer Guide

The original Prusa MK4 is an open-frame FFF printer with a direct-path Nextruder and load-cell first-layer measurement.

Official model specifications

Build volume

250 × 210 × 220 mm

Layer height

0.05-0.30 mm

Hotend limit

300 °C

Bed limit

120 °C

Stock nozzle

0.4 mm

Build surface

Removable PEI spring-steel sheet

Model and upgrade boundary

This page covers the original MK4, not the newer MK4S. The MK4S upgrade changes parts including the high-flow nozzle and cooling; do not substitute current MK4S limits or presets for an unmodified MK4.

Material requirements

●PLA and PETG generally do not need a heated enclosure; excessive chamber heat can be counterproductive.
●ABS and ASA benefit from stable enclosure conditions for larger parts, plus ventilation.
●Flexible materials need a product-matched profile and slower feed; softer grades are more difficult.

Documented workflows

All workflows →

Prusa PLA guidance on original MK4

Manufacturer material guidance explicitly marked relevant for the MK4 family, shown for the original MK4 stock 0.4 mm nozzle. It is not a universal PLA profile.

Nozzle: 215 °C first layer; 210 °C laterBed: 60 °CBuild surface: Smooth or satin PEI sheet

Prusa PETG guidance on original MK4

Manufacturer material guidance explicitly marked relevant for the MK4 family, shown for the original MK4 stock 0.4 mm nozzle. It is not a universal PETG profile.

Nozzle: 230 °C first layer; 240 °C laterBed: 85 °C first layer; 90 °C laterBuild surface: Textured or satin PEI sheet

Prusa ABS guidance on original MK4

Manufacturer material guidance explicitly marked relevant for the MK4 family, shown for the original MK4 stock 0.4 mm nozzle. It is not a universal ABS profile.

Nozzle: 255 °CBed: 100 °C; guide notes 80-110 °C by object sizeBuild surface: PEI sheet with glue separator

Prusa ASA guidance on original MK4

Manufacturer material guidance explicitly marked relevant for the MK4 family, shown for the original MK4 stock 0.4 mm nozzle. It is not a universal ASA profile.

Nozzle: 260 °CBed: 105 °C first layer; 110 °C laterBuild surface: PEI sheet with glue separator

Prusa flexible-material guidance on original MK4

Manufacturer material guidance explicitly marked relevant for the MK4 family, shown for the original MK4 stock 0.4 mm nozzle. It is not a universal TPU profile.

Nozzle: 230-245 °C, depending on hardness and brandBed: 60-75 °C, depending on object sizeBuild surface: Powder-coated sheet or separator