12 of 12 answers for the Original Prusa MK4S are verified against Prusa's published documents, each with its source and date. Checked against Prusa's published documents on 5 October 2026. We have not physically tested this.
Verification means the maker's own page was opened and the quoted words appear on it. It is not a physical test. How we verify.
Prusa lists PLA among the supported materials for the MK4S.
Supported materials PLA, PETG, Flex, PVA, PC, PP, CPE, PVB and when using the Original Prusa Enclosure with filtration add-on ABS, ASA, HIPS, PA
Prusa lists PETG among the supported materials for the MK4S.
Supported materials PLA, PETG, Flex, PVA, PC, PP, CPE, PVB and when using the Original Prusa Enclosure with filtration add-on ABS, ASA, HIPS, PA
Prusa lists Flex among the supported materials for the MK4S.
Supported materials PLA, PETG, Flex, PVA, PC, PP, CPE, PVB and when using the Original Prusa Enclosure with filtration add-on ABS, ASA, HIPS, PA
Prusa lists PVA among the supported materials for the MK4S.
Supported materials PLA, PETG, Flex, PVA, PC, PP, CPE, PVB and when using the Original Prusa Enclosure with filtration add-on ABS, ASA, HIPS, PA
Prusa lists ABS and ASA for the MK4S only when using the Original Prusa Enclosure with the filtration add-on.
Supported materials PLA, PETG, Flex, PVA, PC, PP, CPE, PVB and when using the Original Prusa Enclosure with filtration add-on ABS, ASA, HIPS, PA
Prusa lists PC among the supported materials for the MK4S.
Supported materials PLA, PETG, Flex, PVA, PC, PP, CPE, PVB and when using the Original Prusa Enclosure with filtration add-on ABS, ASA, HIPS, PA
The Prusa Nozzle is designed for Nextruder-based printers including the MK4/S and is built for cold, quick swaps.
Designed for Nextruder-based printers (CORE One, XL, MK4/S, MK3.9/S), the Prusa Nozzle is built for cold, quick swaps
The MK4S ships with the High-flow Prusa Nozzle, brass CHT, 0.4 mm.
Nozzle High-flow Prusa Nozzle brass CHT - 0.4 mm
For carbon-fibre, Kevlar and glass-filled composites Prusa lists a hardened steel nozzle as needed.
✖ A hardened steel nozzle is needed
The MK4S has a Nextruder direct-drive extruder and an all-metal hotend.
Extruder Nextruder, Direct Drive, E3D V6 compatible (with adapter) ... Filament path Aluminum heatsink, all-metal hotend
The MK4S comes with a smooth PEI steel sheet.
Provided steel sheet Smooth PEI Smooth PEI Satin
Prusa publishes a belt-tension maintenance article that covers the MK4/S.
Adjusting belt tension (MK4/S, MK3.9/S, MK3.5/S, MK3/S/+)
Prusa prints the model name on the printer; this register covers the MK4S.
Something wrong on this page? Report an error. Last checked 5 October 2026.