The Bambu Lab A1 Mini (entry) 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. Both are open-frame bed-slinger printers with a 500 mm/s rated top speed and automatic calibration. The MK4S costs $510 more and gets you 98% more build volume and extra engineering materials (ABS, ASA, PA and PC); the A1 Mini answers with 4-slot multicolor.
Overdue for a refresh — no successor announced yet. Prices should be at their lowest
Best for: Budget-conscious beginners who want Bambu's ease of use and multicolor printing in a compact footprint.
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 A1 Mini | Prusa Research MK4S | |
|---|---|---|
| Pricing | ||
| Starting Price | ★ $219 | $729 |
| Print Specs | ||
| Tier | Entry | Prosumer |
| Motion | BedSlinger | BedSlinger |
| Build Volume | 180 × 180 × 180 mm | ★ 250 × 210 × 220 mm |
| Max Speed | 500 mm/s | 500 mm/s |
| Multicolor | ★ ✅ 4 slots | ❌ No |
| Enclosure | ❌ | ❌ |
| Auto Calibration | ✅ | ✅ |
| Open Source | ❌ | ★ ✅ |
| Upgrade Kit | — | 🔧 From MK4, MK3.5 |
| Buy Timing | ||
| Released | Oct 19, 2023 | Aug 13, 2024 |
| Cycle length | ~365 days | ~730 days |
| Cycle advice | Wait | Upgrade Kit |
| Deals advice | Buy | Buy |
| Next model | — | — |
The A1 Mini was released on Oct 19, 2023, 1,120 days ago. Its previous release cycle ran about 365 days; it is now 755 days past that point and no successor has been announced.
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.
On timing alone, the MK4S is the safer buy right now — it is 91 days past its ~730-day cycle with no successor announced, while the A1 Mini is 755 days past its ~365-day cycle with no successor announced.
Cycle and deal status as of November 12, 2026. See the launch calendar →
The A1 Mini lists at $219 and the MK4S at $729 — $510 apart, so the MK4S costs 233% more.
Per litre of build volume, that works out to $38 for the A1 Mini versus $63 for the MK4S — the A1 Mini is the better value per litre as well.
If you are buying before Dec 1, 2026, the active sale tips value toward the A1 Mini.
Our pick for most buyers is the MK4S, for 98% more build volume and extra engineering materials (ABS, ASA, PA and PC), plus better buy-now timing. Go for the A1 Mini instead if you want to spend less — it is $510 cheaper ($219 vs $729).
How we judge timing and deals: read our methodology →
The A1 Mini sets up in minutes with automatic calibration and Bambu's guided first-print workflow.
Up to 4 colors with the AMS Lite accessory — Bambu's filament switching system with minimal waste purging.
Fits on a desk or shelf without taking over your workspace, while still printing at 500 mm/s.
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.