The Bambu Lab A1 and the Prusa MK4S are both popular with home users, but the two companies design printers differently. Bambu Lab focuses on doing everything for you. Prusa focuses on open, repairable hardware you can maintain yourself.
About this guide: it is based on the manufacturers’ published specifications and public information, checked in October 2026. We will add our own test results when we have them. “Check price” links go to the manufacturer’s official store. If a link is an affiliate link, we may earn a commission at no extra cost to you.
The short answer
- Choose the Bambu Lab A1 if you want the easiest start for the money and plan to print mostly PLA and PETG.
- Choose the Prusa MK4S if you want open-source hardware, a higher bed temperature, a kit option, and a printer you can repair and upgrade for years.
Side by side
| Bambu Lab A1 | Prusa MK4S | |
|---|---|---|
| Build volume | 256 × 256 × 256 mm | 250 × 210 × 220 mm |
| Max nozzle temperature | 300 °C | 290 °C |
| Max bed temperature | 100 °C | 120 °C |
| Calibration | Fully automatic: bed level, Z-offset, vibration and flow | Automatic first layer with a load-cell sensor |
| Input shaping | Yes, auto-tuned before every print | Yes |
| Multicolor | AMS lite, up to 4 spools | MMU3 upgrade, up to 5 filaments |
| Official materials | PLA, PETG, TPU, PVA | PLA, PETG, flex, PVA, PC, PP, CPE, PVB, plus ABS and ASA with the enclosure add-on |
| Kit option | No | Yes, or fully assembled |
| Open source | No | Yes |
| Connectivity | Wi-Fi, microSD | Wi-Fi module, Ethernet, NFC, USB drive |
| Built in | China | The EU (Prague) and the USA |
Ease of use
Both printers calibrate their first layer automatically, which is the step that trips up most beginners. The A1 goes further by also tuning vibration and flow before each print, so it needs a little less knowledge to get good results. Prusa’s printers are known for clear documentation and helpful support, which matters when something does go wrong.
Materials
This is the clearest difference. The A1 is built for PLA, PETG and TPU. The MK4S reaches 120 °C on the bed and officially supports more materials, and with Prusa’s enclosure add-on it can also print ABS and ASA. If you want to print tough, heat-resistant parts, the MK4S is the safer choice.
Repairability and openness
Prusa publishes its firmware as open source, shares the designs of its printed parts and sells spare parts for its printers. The MK4S is also available as a kit, so you learn how the printer works while you build it. Bambu Lab sells spare parts too, but the firmware is closed and the experience is built around Bambu Studio and its cloud, with a LAN mode as an option.
Price
The A1 usually costs far less than the MK4S, and even the A1 Combo with the AMS lite tends to cost less than an assembled MK4S. Building the MK4S kit yourself lowers the price. Prices change often, so check both before you decide.
Verdict
For a first printer on a budget, the A1 is the better buy. The MK4S is the better long-term investment if you value open hardware, broader material support and repairability. Neither has an enclosure as standard, so if ABS and ASA are your main goal, look at an enclosed printer like the Prusa Core One+ or Bambu Lab P2S.
Read more: Bambu Lab A1 buyer’s guide