Prusa Research CORE One and MK4S: upgrades that fit
Every part on this page names each of these printers in its manufacturer’s own compatibility documentation, for the stock configuration. Their makers document the same parts for both models, so they share this page. If your printer has a modified hotend, extruder, or bed, check with the part’s maker before buying.
| Manufacturer spec | CORE One | MK4S |
|---|---|---|
| Filament diameter | 1.75 mm | 1.75 mm |
| Stock extruder | Direct drive | Direct drive |
| Hotend maximum | 290 °C (stock hotend) | 290 °C (stock hotend) |
| Build chamber | Enclosed | Open frame |
| Stock nozzle | Brass | Brass |
| Revisions to tell apart | CORE One, CORE One+, CORE One+ (Gen 2) | Not stated |
| Identify yours | CORE One page ↗ | MK4S page ↗ |
Nozzles for the Prusa Research CORE One and MK4S
4 verified options with a manufacturer-documented fit. Compare in the full nozzles guide
| Product | Best for | Skip if | Link |
|---|---|---|---|
| E3D ObXidian Prusa Nextruder Nozzle (0.4 mm, single nozzle (PRUSA-MK4-NOZZLE-OBX-AS-0400)) | Nextruder owners (MK4, MK4S, XL, CORE One, CORE One L) who print carbon-fiber, glass-fiber or glow filaments regularly. | You print only plain PLA and PETG, where a brass Nextruder nozzle does the job. | View on Amazon (opens Amazon in a new tab) |
| E3D Brass Prusa Nextruder Nozzle (0.4 mm brass, single nozzle (PRUSA-MK4-NOZZLE-AS-0400)) | Nextruder owners who want a like-for-like spare for everyday PLA, PETG and ASA. | You print carbon-fiber, glass-fiber or glow filaments. | View on Amazon (opens Amazon in a new tab) |
| E3D ObXidian High Flow Prusa Nextruder Nozzle (0.4 mm, single nozzle (PRUSA-MK4-NOZ-HF-OBX-AS-0400)) | Nextruder owners who want both faster printing and abrasion resistance in one nozzle. | You don't want to tune slicer flow limits, or you print only standard PLA at stock speeds. | View on Amazon (opens Amazon in a new tab) |
| E3D Brass High Flow Prusa Nextruder Nozzle (0.4 mm brass, single nozzle (PRUSA-MK4-NOZ-HF-AS-0400)) | Nextruder owners who want to print everyday PLA, PETG and ASA faster. | You print abrasive filaments or don't plan to raise slicer flow limits. | View on Amazon (opens Amazon in a new tab) |
Build plates for the Prusa Research CORE One and MK4S
2 verified options with a manufacturer-documented fit. Compare in the full build plates guide
| Product | Best for | Skip if | Link |
|---|---|---|---|
| BIQU CryoGrip Pro Glacier Build Plate (Glacier (fine texture), size for Prusa MK4/MK4S/MK3/MK3S/CORE One/CORE One+ (BIQU SKU 1060000759)) | Prusa MK4S or CORE One owners who want a lower-temperature, fine-texture sheet that covers most filaments. | You own a CORE One L or XL, or prefer Prusa’s own sheets. | View on Amazon (opens Amazon in a new tab) |
| BIQU CryoGrip Pro Frostbite Build Plate (Frostbite (coarse texture), matte orange, size for Prusa MK4/MK4S/MK3/MK3S/CORE One/CORE One+ (BIQU SKU 3010200084)) | MK4S or CORE One owners printing mostly PLA and PETG who want very low bed temperatures. | You don’t want to edit PrusaSlicer start G-code, or you print engineering filaments. | View on Amazon (opens Amazon in a new tab) |
Documented for other Prusa Research models, not the Prusa Research CORE One and MK4S
These parts are easy to mistake for a fit. Their makers name a related model but not the Prusa Research CORE One and MK4S, so we don’t list them above.
- Prusa Research MINI Smooth PEI Print Sheet (Spring steel sheet with smooth double-sided PEI for Original Prusa MINI / MINI+): documented for Prusa Research MINI / MINI+
- BIQU CryoGrip Pro Frostbite Build Plate (Frostbite (coarse texture), matte orange, Prusa XL size (BIQU SKU 3010200085)): documented for Prusa Research XL
- Prusa Research Original Prusa XL Enclosure (Kit (shipped disassembled), with HEPA filtration, temperature sensor, and LED strip): documented for Prusa Research XL
- 3D Sourcerer DELACK 3D Printer Enclosure Kit with LED Light (DELACK_V1 kit, 550 x 486 x 450 mm, printed parts not included): documented for Prusa Research MINI / MINI+, Prusa Research MK4
- E3D V6 Brass Nozzle (1.75 mm filament, 0.4 mm, single nozzle (V6-NOZZLE-175-400)): documented for Prusa Research MINI / MINI+
- Micro Swiss CM2 RepRap (V6) 1.75 Nozzle (0.4 mm, single nozzle (M2902-04)): documented for Prusa Research MINI / MINI+
Filament notes for the Prusa Research CORE One and MK4S
Start with Best Filament for the Prusa CORE One, CORE One L and MK4S (2026), which covers what these printerscan and can’t print according to the maker.
Both use 1.75 mm filament. Every spool in our filament shortlists is 1.75 mm, but check the exact listing before you buy. The stock extruder is direct drive, which generally handles flexible filament more easily than a Bowden setup. Automatic material systems are a separate constraint.
- Best PLA Filament (2026): Everyday Spools Matched to Your Printer
- Best PETG Filament (2026): Functional-Part Spools by Printer
- Best TPU Filament (2026): Flexible Spools by Hardness and Feed Path
For a material direction matched to your printer, use the filament finder with the CORE One preselected or the MK4S preselected.
Care gear for any printer
Dryers, storage, and tools don't depend on your printer model. These shortlists cover them.