标题: Bambu Lab H3C Puts 2.85 mm Filament Back in the Spotlight; eSUN to Launch Matching TPU Series [打印本页] 作者: admin 时间: 2026-11-12 10:33 标题: Bambu Lab H3C Puts 2.85 mm Filament Back in the Spotlight; eSUN to Launch Matching TPU Series Nanjixiong's introduction: The launch of Bambu Lab's H3C has brought a filament size long on the fringes of consumer desktop printing back into focus: 2.85 mm. One of the H3C's nine independent print heads is designed specifically for 2.85 mm TPU-75A. Tests reportedly show stable printing of ultra-soft Shore 60A TPU at 10 mm³/s. The machine has opened a path, and material makers are following.
Nanjixiong learned that eSUN will soon launch a 2.85 mm TPU series covering hardness levels from 70A to 85A, with specific optimization for feeding and extrusion of flexible materials.
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1.75 mm vs. 2.85 mm
Both 1.75 mm and 2.85 mm are common filament diameters in FDM/FFF 3D printing. The former is the mainstream choice in consumer desktop printing, while the latter has long been used in some professional and industrial machines.
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Their differences involve not only diameter, but also feeding and extrusion characteristics.
- 1.75 mm filament: supported by a broad range of equipment and the mainstream desktop-printing size, with extensive material choices and applications.
- 2.85 mm filament: has a larger cross-sectional area and generally greater bending stiffness when material hardness and feed structure are similar, which can help reduce bending and deformation while feeding flexible materials.
Why use 2.85 mm for soft materials?
Flexible materials such as TPU are elastic and pliable, but those properties also make them challenging to print. During feeding, flexible filament can be affected by extrusion pressure, the guide path, and the drive mechanism, causing bending, compression deformation, or slippage. Lower-hardness materials such as 75A, 80A, or even 70A have less inherent stiffness and place greater demands on feed-system stability.
The advantage of 2.85 mm filament is mainly structural stability during feeding. At the same material hardness and under similar feed conditions, a larger cross-section typically has greater bending stiffness, is less prone to excessive bending or localized deformation, and can help stabilize the feed path and improve success rates with soft filament.
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eSUN's 2.85 mm TPU series is coming soon
With 20 years in the 3D-printing materials industry, eSUN is drawing on its established TPU formulation technology and experience producing 2.85 mm filament to launch a new series in 70A, 75A, 80A, and 85A hardness grades, expanding the available flexible materials.
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The new series will be adapted to the feeding and extrusion characteristics of 2.85 mm filament through optimization of the formulation, melt flow, and filament-processing methods.
- Flexibility and mechanical performance: balances pliability, elastic recovery, and tear resistance for different functional elastomer components.
- Stable extrusion: matches melt-flow properties to printing processes to support continuous, uniform extrusion.
- Diameter consistency and quality control: strengthens dimensional monitoring and quality management to reduce the effect of diameter variation on feeding and extrusion stability.
From formulation to filament processing, eSUN continues to expand its flexible-material portfolio and offer more choices for different equipment and applications.
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2.85 mm TPU broadens the range of flexible 3D-printing applications
As flexible-material printing develops, TPU is expanding beyond consumer products such as protective cases and cushioning pads into sports equipment, robotics, and industrial functional parts. With different hardness grades and structural designs, 2.85 mm TPU can provide more options on compatible machines.
- Footwear and wearable equipment: running-shoe midsoles, bicycle seats, sports-protection pads, and wearable accessories can use different hardnesses and internal structures to provide elastic support, cushioning, and a comfortable fit.
- Industrial automation and robotics: flexible grippers, industrial seals, cushioning pads, and protective components can use TPU's elasticity and flexibility for robot end effectors, equipment protection, and flexible connections.
- Medical rehabilitation and personalization: custom orthotic insoles, orthosis pads, and rehabilitation aids can use 3D printing's design freedom for more personalized fit and cushioning.
The H3C's significance is that one of its nine independent tool heads gives 2.85 mm soft TPU a clear machine-level entry point. This signals that the bottleneck in printing soft material is not whether it can be extruded, but whether it can be extruded reliably and repeatably. The 2.85 mm diameter addresses a physical prerequisite for stability, while filament-diameter consistency, melt flow, and mechanical properties determine whether that prerequisite becomes real-world print success.
eSUN's launch of a 2.85 mm TPU range at this moment follows a clear logic: the equipment has defined a niche demand, and material makers need to provide a complete, feed-system-compatible selection across hardness grades. From 70A to 85A, and from footwear to robot grippers, soft-material printing is moving from parameter experiments by enthusiasts toward engineering practice in which materials are selected for specific applications. Its future depends on continued coordination between equipment and material makers. For now, both are moving in the same direction.
AI-translated from an article by Xiaoruanxiong on Nanjixiong, originally published on 2026-11-09. Text and images retain the original source attribution. Read the original Chinese article
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