Sermoon D3 Review

The Creality Sermoon D3 is built around a single core capability: dual direct drive extrusion in a fully enclosed chamber. This combination enables a workflow that single-nozzle machines fundamentally cannot replicate — dual-material printing where the second nozzle dispenses a soluble support material (PVA or HIPS) that is dissolved in water or limonene after printing, leaving behind perfectly clean, support-free surfaces on complex overhangs and internal geometries.

For functional part engineering, soluble supports are transformative. Complex mechanical assemblies with internal channels, living hinge mechanisms, undercut features, and multi-component parts that would require elaborate multi-part designs to avoid support removal can be printed as single unified objects with the D3's dual-material workflow. The quality of support contact surfaces on soluble-supported prints is significantly higher than manually removed supports, and the post-processing time is reduced to a soak rather than a painstaking pick-and-peel session.

The full enclosure is the second key differentiator. ABS and ASA — the most common engineering-grade materials that benefit from support structures — require a stable thermal environment to print without warping. The Sermoon D3's enclosed chamber maintains a consistent ambient temperature around the print during the job, enabling reliable large-format ABS printing that is simply not achievable on open-frame machines regardless of bed adhesion technique.

Operating a dual nozzle system reliably requires more attention to calibration than a single nozzle machine. Nozzle offset calibration — ensuring both nozzles print at exactly the same Z height and at precise XY offsets — is the critical setup step. On the Sermoon D3, this is managed through the on-screen calibration wizard and a test print sequence. First-time setup typically takes 30–45 minutes for a new user to complete correctly.

Ooze management is the ongoing operational consideration unique to dual-nozzle printing. When one nozzle is inactive during a print pass, it must remain hot enough to print again without a prime delay, but it will slowly ooze material from thermal expansion. A purge tower — a disposable block printed at the side of the build plate where both nozzles purge briefly before each layer switch — is the standard solution and is built into most dual-extrusion slicer profiles. The purge tower wastes a small amount of filament per layer change but reliably prevents nozzle contamination.

PVA dissolution workflow: PVA-supported prints are placed in warm water (40–50°C) and the soluble support material dissolves in 2–4 hours depending on support geometry complexity. The resulting surface where supports were in contact is significantly smoother than manually removed support interfaces — a clear, practical quality advantage for functional parts with internal cavities or undercut features.

The Sermoon D3's full enclosure is the key enabler of reliable ABS and ASA printing. ABS shrinks approximately 0.5–0.8% as it cools from extrusion temperature to ambient — and if ambient temperature varies during a print (as it does in any open-frame machine or draughty environment), differential cooling produces internal stresses that cause warping, layer delamination, and part lifting from the build plate.

In the Sermoon D3's enclosed chamber, ambient temperature builds up during printing (the heated bed and hotends act as heat sources) and stabilises at 35–50°C depending on the print. This consistent ambient environment eliminates the differential cooling that causes ABS warping, allowing large ABS parts to be printed reliably without elaborate bed adhesion protocols or warp mitigation techniques.

ASA, which shares ABS's warping tendencies but adds excellent UV and weather resistance (making it popular for outdoor functional parts), benefits equally from the enclosure. With the Sermoon D3, ASA printing is straightforward — the same enclosed ABS workflow applies. For makers producing outdoor hardware, brackets, or enclosures that will see sunlight and temperature cycling, ASA on the Sermoon D3 is an important capability.

ABS and ASA printing emit volatile organic compounds (VOCs) and ultrafine particles during extrusion. In unventilated spaces, extended ABS printing can produce perceptible chemical odours and measurable particle concentrations. The Sermoon D3's HEPA + activated carbon filtration system captures fine particles and adsorbs VOCs, significantly reducing the air quality impact of enclosed ABS and ASA printing.

For office environments and home workspaces where running ABS prints during working hours is desirable, the HEPA filtration is a meaningful quality-of-life and safety feature. While the filtration system is not a substitute for room ventilation in poorly ventilated spaces, it does reduce the practical concerns of ABS printing enough that most users find the Sermoon D3 operable in regular occupied environments.

Filter replacement is a maintenance consideration — HEPA and activated carbon filters have finite capacity and require periodic replacement (Creality recommends replacement every 200–300 hours of ABS printing). For heavy ABS users, factoring filter cost into the total operating cost is worthwhile.

The Sermoon D3 is for engineers, product designers, functional part makers, and advanced hobbyists who specifically need dual-material printing with soluble supports and/or enclosed ABS/ASA capability. If your workflow involves complex geometries where support removal leaves unacceptable surface defects, or functional parts in ABS/ASA that require consistent quality at larger sizes, the Sermoon D3 is the Creality machine purpose-built for you.

It's also a valuable office machine for small design studios or engineering departments that need a professional FDM printer with clean-air operation. The HEPA filtration, full enclosure, and professional dual-material capability make the Sermoon D3 appropriate for shared professional workspaces in a way that open-frame ABS machines are not.

Makers whose primary materials are PLA and PETG, and who don't need dual-material printing, are better served by any of the K1 or K2 series machines that offer faster speeds and more straightforward single-nozzle operation. The Sermoon D3's value is specifically in its dual-nozzle and enclosure combination.