The Bambu Lab H2S (professional) and Prusa Research MK4S (prosumer) come from different brands and sit in different tiers, so this is less a head-to-head than a question of how much printer you need. The H2S costs $520 more and gets you an enclosed chamber (with PA-CF and PPS on its materials list) and 220% more build volume; the MK4S answers with an open-source design.
Mid-cycle — watch for announcements before buying
Best for: Professional makers and studios who need Bambu's largest enclosed build volume for high-throughput production, engineering materials, and optional AMS multicolor — without the complexity of dual-nozzle printing.
Full details →Late in cycle — but an upgrade kit is available. Existing owners can upgrade without buying new
🔧 Upgrade kit available — from MK4, MK3.5
Best for: Makers who value open-source hardware, community support, long-term repairability, and battle-tested reliability over raw speed or multicolor features.
Full details →| Bambu Lab H2S | Prusa Research MK4S | |
|---|---|---|
| Pricing | ||
| Starting Price | $1,249 | ★ $729 |
| Print Specs | ||
| Tier | Professional | Prosumer |
| Motion | CoreXY | BedSlinger |
| Build Volume | ★ 340 × 320 × 340 mm | 250 × 210 × 220 mm |
| Max Speed | ★ 1000 mm/s | 500 mm/s |
| Multicolor | ★ ✅ 4 slots | ❌ No |
| Enclosure | ★ ✅ | ❌ |
| Auto Calibration | ✅ | ✅ |
| Open Source | ❌ | ★ ✅ |
| Upgrade Kit | — | 🔧 From MK4, MK3.5 |
| Buy Timing | ||
| Released | Aug 26, 2025 | Aug 13, 2024 |
| Cycle length | ~730 days | ~730 days |
| Cycle advice | Caution | Upgrade Kit |
| Deals advice | Buy | Buy |
| Next model | — | — |
The H2S was released on Aug 26, 2025, 443 days ago. Its previous release cycle ran about 730 days, so it is 61% of the way through — roughly 287 days before a successor would be due at that pace.
The MK4S was released on Aug 13, 2024, 821 days ago. Its previous release cycle ran about 730 days; it is now 91 days past that point and no successor has been announced.
Neither is a clear buy-now on timing, so watch for announcements before committing. The MK4S is further along (112% vs 61%).
Cycle and deal status as of November 12, 2026. See the launch calendar →
The MK4S lists at $729 and the H2S at $1,249 — $520 apart, so the H2S costs 71% more.
Per litre of build volume, that works out to $34 for the H2S versus $63 for the MK4S — so the pricier H2S actually gives you more build space per dollar.
If you are buying before Dec 5, 2026, the active sale tips value toward the H2S.
Our pick for most buyers is the H2S, for an enclosed chamber (with PA-CF and PPS on its materials list) and 220% more build volume, plus a higher editor score (9.1 vs 8.9). Go for the MK4S instead if you want to spend less — it is $520 cheaper ($729 vs $1,249). The H2S is also in a sale window right now (Bambu Black Friday 2026, until Dec 5, 2026).
How we judge timing and deals: read our methodology →
The H2S offers more than twice the print volume of the X2D. At 1000 mm/s it is also among Bambu's fastest printers, making it the top choice for high-throughput professional production.
The enclosed chamber with active heating handles the full engineering filament spectrum — ABS, ASA, PA, PA-CF, PC, and PPS — with consistent results across the full build plate.
The H2S supports up to 12 AMS units (4 AMS 2 Pro + 8 AMS HT), enabling 24-filament printing for large-format multicolor production.
MK4 and MK3.5 owners can upgrade to MK4S specs without purchasing a whole new printer. This is Prusa's commitment to owners and is unique in the industry at this level.
Firmware, PCB schematics, hardware designs, and slicing profiles are all published under open licenses. You own the printer completely.
Prusa's forum, knowledge base, and repair guides are unmatched. Parts are stocked and available for years after purchase.