The Test Setup
Both machines printed the same 5-inch freestyle frame arm profile — a structurally demanding part with overhangs, tight dimensional tolerances, and a requirement for layer-to-layer consistency. We ran 30 consecutive days of daily prints using Bambu Lab PETG-CF on both machines, logging accuracy, failure rate, print time, and total intervention time required per week.
The results were closer than we expected. And the deciding factor was not the one most people argue about online.
Bambu Lab P1S Speed & Automation
The P1S printed every single arm in our test without a failure. Not one. The LiDAR-assisted first-layer calibration and automatic vibration compensation meant we intervened exactly zero times across 30 print sessions. Total hands-on time: about 40 minutes over the whole month, mostly swapping filament.
Dimensional accuracy averaged 0.12 mm across all printed arms — well within the tolerance needed for a secure motor mount fit. Print time per arm was 34 minutes at balanced quality settings. The enclosed chamber kept ASA prints warp-free without any additional prep.
The trade-off: the P1S is a closed ecosystem. When the extruder cable on our test unit developed an intermittent fault on day 22, the repair required a Bambu-specific spare part and a 4-day wait. With a Prusa, that fault would have been diagnosed, ordered, and fixed in an evening.
FDM Printer // Enclosed
Bambu Lab P1S
- Fully enclosed heated chamber — ABS, ASA, PETG-CF, zero warping issues
- Automated calibration — hands-off operation after initial setup
- Multi-material AMS support for drone parts in two materials simultaneously
- 500 mm/s top speed: a complete frame arm in under 35 minutes
- Built-in AI failure detection eliminates wasted overnight prints
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◆ Pros
- Zero failures across 30-day test
- Fastest print times in category
- True hands-off automation
- Excellent CF composite results
― Cons
- Proprietary parts — repairs require Bambu supply chain
- No offline use without workarounds
- Overkill if you only print PETG/PLA
◆ AeroInfill Verdict
Buy the P1S if throughput and reliability are your priority. For builders who print drone parts regularly and want maximum output with minimum babysitting, nothing at this price point comes close.
Prusa MK4S Repair & Own
The Prusa MK4S had two minor calibration drifts over the 30-day test, both self-corrected with its input shaper. Dimensional accuracy averaged 0.15 mm — slightly behind the Bambu, but comfortably within functional tolerance for every part we tested. Print time per arm: 48 minutes.
What the MK4S does that the Bambu cannot: complete mechanical transparency. Every bearing, every stepper, every hotend component is documented, stocked, and replaceable with a hex key. The day 22 extruder fault that cost us 4 days on the Bambu? On the Prusa, we would have identified the issue in 10 minutes from the troubleshooting wiki and had a $6 part on the way the same afternoon.
For drone builders who are also makers — who want to understand and maintain their tools, not just consume them — the MK4S's repairability philosophy is genuinely valuable, not just a talking point.
FDM Printer // Open Frame
Prusa MK4S
- Every component replaceable — parts stocked, all repairs documented publicly
- Input shaper self-calibration eliminates ringing on functional parts
- All-metal hotend handles PETG-CF and flexible TPU without swaps
- Largest 3D printing community on the planet — every fix already documented
- No cloud account required — fully offline capable
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◆ Pros
- Most repairable printer available
- Open source firmware and hardware
- Excellent community support
- True offline independence
― Cons
- 30-40% slower than Bambu for equivalent parts
- Open frame requires enclosure for ASA/ABS
- More manual tuning needed
◆ AeroInfill Verdict
Buy the MK4S if you want to own your tools for the long term. The MK4S is not the fastest printer, but it is the most honest one. If you value repairability, transparency, and independence from proprietary supply chains, nothing else comes close.
Which One Should You Buy?
If you want to maximise output with minimum effort, buy the Bambu Lab P1S. If you want to own and understand your machine indefinitely, buy the Prusa MK4S. Both print excellent drone parts. The decision is about your relationship with your tools, not the parts themselves.