Original Prusa I3 MK3 VS Creality CR-10S

An honest comparison has to start by retiring an error: the old version of this article gave both printers the same features list and claimed the Prusa i3 MK3 runs on an “MKS Gen L” board. It does not — the MK3’s board is Prusa’s own Einsy RAMBo, with TMC2130 drivers, and the two machines’ feature sets are quite different. What they genuinely share is an era and a silhouette: tall, open-frame, single-extruder machines from 2017–18. Everything else — size, levelling, extruder, electronics philosophy — is a study in two companies spending money in opposite places. Creality spent it on size; Prusa spent it on automation.

Prusa i3 MK3 vs Creality CR-10S: specifications

Specification	Original Prusa i3 MK3	Creality CR-10S
Build volume	250 × 210 × 210 mm	300 × 300 × 400 mm
Frame / layout	Integrated frame, moving bed	Gantry + separate control box
Extruder	Direct drive (Bondtech gears)	Bowden, single gear
Bed levelling	Automatic mesh levelling (PINDA probe)	Manual, four knobs (large bed)
Print surface	Removable magnetic spring-steel sheet	Glass plate
Filament sensor	Yes	Yes — a CR-10S headline feature
Z drive	Dual motors, integrated leadscrews	Dual Z screws and motors
Mainboard	Einsy RAMBo, TMC2130 drivers	Creality V2.x 8-bit (ATmega2560)
Power	24 V	12 V

Size: the CR-10S’s whole argument

The CR-10S prints roughly twice the volume of the MK3, and that is not a spec-sheet abstraction: helmets in one piece, large props, big functional parts, and batches laid out on a 300 × 300 mm bed that the MK3’s 250 × 210 mm simply cannot hold. If the things you want to make are big, this row decides the comparison on its own — no amount of Prusa polish enlarges a build plate. The cost of that size is paid in the other rows: a big glass bed levelled by hand, a Bowden extruder chosen to keep a large moving gantry light, and a separate control box with a fan you will hear. Bed adhesion and levelling discipline on that large glass surface are the CR-10S owner’s core skills — our CR-10 bed adhesion guide is the survival manual.

Automation: the MK3’s whole argument

Everything the CR-10S asks you to do by hand, the MK3 instruments away. The PINDA probe maps the bed before each print; the filament sensor watches the spool; Power Panic survives an outage; the spring-steel sheet releases prints with a flex instead of a scraper; the Einsy board’s TMC2130s home without endstop switches and detect crashes. Even the Z axis philosophy differs: the MK3’s dual motors are kept in step by the probe routine, while the CR-10S’s dual screws can drift out of sync and need the occasional manual re-square. Neither machine is “better” in the abstract — they are optimised around opposite scarcities, bench space and money on one side, owner attention on the other.

One shared headline deserves a footnote: both machines advertise a filament runout sensor, which was not a given in 2017. The CR-10S’s is a simple mechanical switch doing one job; the MK3’s (optical on the MK3, IR on the MK3S) also feeds into its load/unload automation. Same bullet point, different depth — a fair summary of the entire comparison.

Ownership today

Both are discontinued, community-supported machines now, and both have deep knowledge bases. The differences that decide a used purchase:

• Parts: CR-10S parts are cheap and everywhere (it shares the CR-10 ecosystem), and its board story is simple — our V2.1 mainboard guide covers the versions. Prusa parts are high quality and still supplied by Prusa, at Prusa prices.
• Noise: the MK3 is the far quieter machine stock; a CR-10S only approaches it with the later silent-board (V2.2) version or an upgrade.
• Workload fit: big prints and batches → CR-10S. Smaller prints, frequent material changes, flexible filament, unattended running → MK3.
• Resale: tidy MK3s hold value stubbornly; CR-10S machines are cheap enough used that condition matters more than haggling.

Frequently asked questions

What board does the Prusa MK3 actually use?

Prusa’s own Einsy RAMBo — an ATmega2560-based board with TMC2130 stepper drivers, sensorless homing and crash detection. It is not an MKS Gen L or any other generic board; that claim in older articles is an error.

Which is bigger, the MK3 or the CR-10S?

The CR-10S, by a lot: 300 × 300 × 400 mm against the MK3’s 250 × 210 × 210 mm — roughly double the printable volume. For large parts, this is the deciding specification.

Which is easier to live with day to day?

The MK3. Automatic mesh levelling, a flex-off spring-steel surface, filament sensing and power-loss recovery remove most of the routine friction that the CR-10S leaves to the owner — especially levelling and adhesion on its large glass bed.

Does the CR-10S have a filament sensor?

Yes — a mechanical runout sensor was one of its headline features, alongside dual Z. It pauses the print when filament runs out; it is simpler than the MK3’s sensor system but covers the essential job.

Which should I buy used?

Buy the CR-10S if your projects need the volume — nothing else at its used price prints that big. Buy the MK3 if your parts fit its bed and you want the machine that asks the least of you. Condition and completeness matter more than the badge at this age.