The FLSUN S1 and S1 Pro are high-speed, enclosed delta-style 3D printers designed to deliver rapid, reliable, and high-quality prints. Both models share the same generous Φ320 × 320 × 430 mm build volume, 350 °C hot end, and full-metal frame, making them capable of processing everything from standard PLA to demanding engineering materials. While the S1 sets a high bar for speed and ease of use right out of the box, the S1 Pro refines that formula—quieter operation, enhanced reliability features, and expanded material support—catering to power users and small-team environments.
Design
Visually and mechanically, the two machines are nearly identical: both feature acrylic-and-glass enclosures, CPAP turbo fans for part cooling, textured PEI print plates, and full-gear direct-drive extruders with hardened-steel nozzles. However, the S1 Pro reduces operational noise significantly—from a maximum of 70 dB on the FLSUN S1 down to 55 dB—allowing for a more tranquil workspace during long print jobs. The S1 Pro also incorporates an upgraded air filtration system (HEPA + activated carbon) to further improve the printing environment. Both arrive 95 % pre-assembled, requiring only the installation of the front door and glass panels before printing.
Features
Under the hood, both printers share blistering performance: up to 1,200 mm/s max printing speed, 40,000 mm/s² acceleration, and a peak flow rate of 110 mm³/s with PLA. Their 350 °C hot ends unlock a wide material palette—PLA, PETG, ABA/ABS, TPU, and even glass-fiber-reinforced filaments. The FLSUN S1 Pro goes a step further by officially supporting high-temperature, mechanically robust, and chemically resistant materials such as PA, PC, PET, and carbon/glass-fiber-reinforced PLA.
Both models include power-loss resume, automatic bed leveling, vibration compensation, filament run-out and clog detection, debris and “spaghetti” detection, plus real-time camera monitoring with time-lapse capture. The S1 Pro’s “Algorithms 2.0” suite enhances bed leveling, motion calibration, pressure advance, and filament sensing to reduce print failures and improve first-layer adhesion. Maintenance is simplified on both machines thanks to modularized effectors and housing components, but the FLSUN S1 Pro’s design emphasizes even greater ease of servicing.
Conclusion
For most hobbyists and entry-level prosumers, the FLSUN S1 offers a compelling mix of speed, reliability, and material versatility at an attractive price point. If your priorities include near-silent operation, more advanced materials support, enhanced air filtration, and the most robust error-reduction algorithms, the FLSUN S1 Pro is the clear upgrade. Both printers excel in delivering fast, accurate prints, but the Pro’s refinements make it ideal for environments where noise, air quality, and minimal downtime are paramount.
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