Prusa Research i3 MK3S / MK3S+: upgrades that fit
Every part on this page names the Prusa Research i3 MK3S / MK3S+ in its manufacturer’s own compatibility documentation, for the stock configuration. If your printer has a modified hotend, extruder, or bed, check with the part’s maker before buying.
- Filament diameter
- 1.75 mm (manufacturer spec)
- Stock extruder
- Direct drive (manufacturer spec)
- Hotend maximum
- 300 °C (stock hotend) (manufacturer spec)
- Revisions to tell apart
- MK3S, MK3S+
- Identify yours
- Manufacturer page ↗
Build plates for the Prusa Research i3 MK3S / MK3S+
1 verified option 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) |
- CryoGrip Pro Glacier Build Plate: documented for MK3S only.
Documented for other Prusa Research models, not the Prusa Research i3 MK3S / MK3S+
These parts are easy to mistake for a fit. Their makers name a related model but not the Prusa Research i3 MK3S / MK3S+, 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, size for Prusa MK4/MK4S/MK3/MK3S/CORE One/CORE One+ (BIQU SKU 3010200084)): documented for Prusa Research MK4S, Prusa Research CORE One, Prusa Research MK4
- 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 ObXidian Prusa Nextruder Nozzle (0.4 mm, single nozzle (PRUSA-MK4-NOZZLE-OBX-AS-0400)): documented for Prusa Research MK4S, Prusa Research CORE One, Prusa Research CORE One L, Prusa Research XL, Prusa Research MK4
- E3D Brass Prusa Nextruder Nozzle (0.4 mm brass, single nozzle (PRUSA-MK4-NOZZLE-AS-0400)): documented for Prusa Research MK4S, Prusa Research CORE One, Prusa Research CORE One L, Prusa Research XL, Prusa Research MK4
- E3D ObXidian High Flow Prusa Nextruder Nozzle (0.4 mm, single nozzle (PRUSA-MK4-NOZ-HF-OBX-AS-0400)): documented for Prusa Research MK4S, Prusa Research CORE One, Prusa Research CORE One L, Prusa Research XL, Prusa Research MK4
Filament notes for the Prusa Research i3 MK3S / MK3S+
Start with Best Filament for the Original Prusa MK3S and MK3S+ (2026), which covers what the printercan and can’t print according to the maker.
The Prusa Research i3 MK3S / MK3S+ uses 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 i3 MK3S / MK3S+ preselected.
Care gear for any printer
Dryers, storage, and tools don't depend on your printer model. These shortlists cover them.