A single spool of bad filament can cost a brand its reputation. When a 3D printing filament manufacturer ips thousands of spools a month, the failures that matter are not dramatic — they are the quiet ones: a spool that runs 40 meters and clogs the hot end, a diameter that drifts 0.06 mm in the middle of a reel, a batch of PETG that prints with bubbles, an ABS spool so tangled that the user throws it away. Each one is a returned order, a bad review, and a lost customer.
Mass filament production therefore demands more than an extruder that melts plastic. It demands stable tolerance — the diameter held true from the first meter to the last, through every material change and every speed adjustment. It demands neat winding — the spool laid down layer by layer, with constant tension, so the printer feeds without tangles to the very end. And it demands economic for mass production — a line that converts resin into saleable filament at a cost per kilogram that keeps the manufacturer competitive.
The Chenxing ABS/PETG/PLA 3D Filament Extrusion Line — a complete 3D printer filament extruder machine — is engineered for exactly that. It is a production-grade 3D filament extrusion line offered in three models — SJ-45, SJ-35, and SJ-25 — covering output from laboratory batch work (1–2 kg/h) to industrial mass production (20–25 kg/h). The line processes ABS, PLA, PC, PA, PET, PETG, PEI, PVA, PEEK, and other 3D printing materials, with a laser gauge holding tolerance to +/-0.02 mm, an S136 forged die with a special flow-dividing and pressure-boosting structure, and a servo-driven winder that produces spools ready for the printer.
This page focuses on the three filament families that make up the majority of the FDM market — ABS, PETG, and PLA — and ows how the line is configured around their different drying, temperature, and cooling requirements.
The 3D filament extrusion line is a complete, nine-module production system. Every module exists for one reason: to deliver a filament with stable diameter, stable surface, and stable winding — at production speed.
ABS, PETG, and PLA are all hygroscopic to different degrees: moisture absorbed from the air becomes steam inside the barrel, producing bubbles, voids, and surface defects that destroy filament quality. The pellets are dried before extrusion — PETG and ABS require strict dehumidifying drying, while PLA needs consistent low-moisture storage. The line integrates with the Chenxing drying range: the 750A dehumidifying dryer supplies low-dew-point air for production-scale drying, the 201A/J conveying integrated crystal dehumidification dryer combines drying and conveying for crystalline polymers, the 530A crystal dryer covers compact duties, and the STG-U hopper drier / plastic resin dryer is the general-purpose option.
The dried pellets are fed into the hopper of the main extruder. For consistent dosing at production speed, the line works with the Chenxing feeding range: the VLF powder suction machine and the VLF-L continuous powder suction machine transfer powder materials, the FSP cruing material suction machine handles regrind, and the screw feeder automatic feeding machine delivers precise volumetric dosing. A CJ magnetic frame hopper magnet removes ferrous contamination at the feed throat.
The heart of the line is the SJ main extruder — the model is selected by output requirement: the SJ-45 (45 mm screw), the SJ-35 (35 mm screw), or the SJ-25 (25 mm screw). The rotating screw transports the pellets forward, compacting, melting, and mixing them into a homogeneous melt with stable melting and extrusion — no color difference, no hollow material, and no bubbles in the finied product. Melt stability is the first gate of tolerance: a fluctuating melt produces a fluctuating diameter, no matter how good the downstream measurement is. The line reaches a production capacity of 30–100 m/min, depending on material and model.
The melt is pued through the 1.75 mm filament extrusion die, manufactured from forged S136 steel with a special flow-dividing and pressure-boosting structure. The die structure distributes the melt evenly and maintains stable die pressure, which is the foundation of stable extrusion. A single die set produces multiple diameters: the conventional 1.75 mm and 3.0 mm, plus 2.0 mm and 2.85 mm — one tool serves the full FDM diameter range, producing high-precision, multi-color 3D filament for high-precision printed models.
The hot strand enters the 4-meter automatic circulation heating tank, built in SUS304 stainless steel. The heating tank temperature is adjustable at the end of the tank, and is set according to the raw material — approximately 85°C for ABS and approximately 60°C for PLA — to avoid the strand cooling too fast and becoming brittle. The strand then passes through the 2-meter cooling water tank, also SUS304 stainless steel, which cools the filament gradually, stage by stage. The staged heating-then-cooling sequence protects roundness and prevents internal stress, so the finied filament is not only dimensionally accurate but also free of the brittleness that causes breakage in printing.
Two drying devices with special water sleeve rings wipe and dry the surface of the filament as it leaves the water stages. A dry surface is required before laser measurement — water droplets would scatter the laser beam and produce false readings — and it also protects the finied spool from moisture pickup.
The filament travels through the 8-meter storage device, which holds a maximum line length of 100 meters, with a 0.75 kW motor, tension control via magnetic particle clutch, and a 4.0 mm line path on a 250 mm spool. The storage section creates the buffer and tension isolation needed during spool changeover, so the filament never touches the floor or picks up contamination while the winder is being changed.
A laser controller dynamically measures the diameter of the moving filament, holding tolerance to +/-0.02 mm. The measurement feeds the automatic feedback system of the line: as the measured diameter deviates, the haul-off speed and extruder output are corrected in real time. On the SJ-45 the control is an automatic feedback system; on the SJ-35 it is tractor control; both keep the diameter inside the tolerance band over the full reel.
The four-wheel haul-off device pulls the filament at the speed commanded by the control loop. It is built with precision guide pillars, driven by a 0.75 kW motor, and controlled by a high-frequency frequency inverter. The traction surface uses multi-wedge belts with abrasion-resistant surfaces. The haul-off regulates the line speed to control the filament diameter and guarantee the roundness of the finied product — the second half of the closed loop.
At the end of the line, the single spool auto winder winds the finied filament onto spools with automatic metering, tension control, and automatic line arrangement, driven by a servo motor control system. Chenxing's neat winding technology lays the filament layer by layer with constant tension, so the finied spool is tidy and tangle-free — preventing the kinking and tangling problems that cause print failures and user frustration. The finied product can be neatly wound, ready for vacuum packaging.
| Parameter | SJ-45 | SJ-35 | SJ-25 |
|---|---|---|---|
| Capacity | 20–25 kg/h | 8–12 kg/h | 1–2 kg/h |
| Screw diameter | 45 mm | 35 mm | 25 mm |
| L/D ratio | 28:1 | Customized on request | 25:1 |
| Total power | 40 kW | 30 kW | 7 kW |
| Filament quantity | 1 | 1 | 1 |
| Filament diameter | φ1.75 / φ3.00 mm | Customized on request | Customized on request |
| Tolerance | 0.02 mm | 0.03 mm | Customized on request |
| Diameter control | Automatic feedback system | Tractor control | Customized on request |
| Operating temperature | 0–480°C | 0–480°C | 0–480°C |
| Dimensions (L×W×H) | 15000×1500×2300 mm | 15000×1500×2300 mm | 4000×800×1500 mm |
| Weight | 2300 kg | 2100 kg | 500 kg |
| Certification | CE | CE | CE |
| Parameter | Value |
|---|---|
| Production capacity | 30–100 m/min |
| Filament diameters | 1.75 mm 2.0 mm 2.85 mm / 3.0 mm from one S136 die set |
| Laser gauge tolerance | +/-0.02 mm (dynamic measurement) |
| Heating tank temperature | Set per material: ABS approx. 85°C, PLA approx. 60°C |
| Storage buffer | 8 m device, max 100 m line length, 0.75 kW motor, magnetic particle clutch, 4.0 mm line, 250 mm spool |
| Haul-off drive | 0.75 kW motor, high-frequency inverter, precision guide pillars, multi-wedge belt traction |
| Winder | Servo motor, automatic metering, tension control, automatic line arrangement |
| Die steel | Forged S136, special flow-dividing and pressure-boosting structure |
| Tank material | SUS304 stainless steel |
| Design materials | ABS, PLA, PC, PA, PET, PETG, PEI, PVA, PEEK and other 3D printing materials |
| Optional add-on | 3D printer plastic recycler (filament recycling machine) |
Parameters not provided on the source page — such as heating power per zone, temperature control accuracy, and inverter brand — are customized to the project and available on request from the Chenxing engineering team. The latest commercial quotation, MOQ, and lead time are confirmed by the sales team for each project.
Feature: Laser controller with dynamic measurement at +/-0.02 mm tolerance, closed-loop automatic feedback (SJ-45) or tractor control (SJ-35) synchronizing haul-off with extruder output.
Advantage: Diameter drift, ovality, and spikes are corrected in real time — from the first meter of a reel to the last.
Benefit: Every spool prints reliably: fewer clogs, fewer failed prints, fewer returns, and a reputation for consistency that commodity brands cannot match.
Feature: Single spool auto winder with servo motor control, automatic metering, tension control, and automatic line arrangement; 8 m storage buffer with magnetic particle clutch isolates tension during changeover.
Advantage: The filament is laid layer by layer under constant tension, so the spool is tidy and stress-free from core to rim.
Benefit: Users feed the printer without kinking or tangling — the finiing quality that determines whether a customer reorders or returns.
Feature: Three series models — SJ-45 (20–25 kg/h), SJ-35 (8–12 kg/h), and SJ-25 (1–2 kg/h) — with production capacity of 30–100 m/min.
Advantage: The manufacturer matches the line to demand: a compact lab-scale SJ-25, a mid-range SJ-35, or an industrial SJ-45 — without over-investing in capacity.
Benefit: Low entry cost for startups, proven scale-up path for growing producers, and a line that pays for itself in saleable filament.
Feature: The line is designed to extrude ABS, PLA, PC, PA, PET, PETG, PEI, PVA, PEEK, and other 3D printing materials, with material-matched tank temperatures (ABS approx. 85°C, PLA approx. 60°C).
Advantage: One line produces the most popular filament families — engineering ABS, functional PETG, and eco-friendly PLA — plus engineering and specialty materials as the market grows.
Benefit: A diversified product range from a single investment, with drying and cooling configured per material.
Feature: The SJ main extruder delivers stable melting and extrusion, and the forged S136 die with special flow-dividing and pressure-boosting structure maintains uniform die pressure.
Advantage: Melt homogeneity and stable die pressure eliminate the classic filament defects — color streaks, hollow cores, and gas bubbles — that appear as surface and diameter faults.
Benefit: High-quality, high-precision, multi-color filament that produces accurate printed models — and a product that passes customer inspection.
Feature: A 4 m SUS304 automatic circulation heating tank with adjustable end temperature (ABS approx. 85°C, PLA approx. 60°C), followed by a 2 m SUS304 cooling tank for gradual, stage-by-stage cooling.
Advantage: The strand is not quenched too fast, so it does not become brittle; roundness and internal stress are controlled through the cooling curve.
Benefit: Filament that survives handling, ipping, and printing without breaking — the mechanical quality behind a reliable spool.
Feature: The line can be equipped with an optional 3D printer plastic recycler that reclaims waste and off-spec filament.
Advantage: Production scrap becomes raw material again, closing the material loop inside the factory.
Benefit: Lower material cost, less waste, and a more sustainable filament business — an economic and environmental advantage in one add-on.
The line's three headline materials cover the three main segments of the FDM market. Each has different processing demands, and the line is configured around them.
| Material | Key Properties | Drying / Processing Notes | Typical Applications |
|---|---|---|---|
| ABS | High strength, good heat resistance, tough; prone to warping; hygroscopic | Requires strict drying before extrusion (moisture causes bubbles and surface defects); higher extrusion and tank temperatures (heating tank approx. 85°C) | Automotive parts, electronic housings, functional prototypes, jigs and fixtures |
| PETG | Transparent, impact-resistant, low warpage; excellent print surface quality | Requires strict dehumidifying drying; moderate extrusion temperature; material-matched cooling for clarity and dimensional stability | Functional consumer parts, containers, display and protective parts, industrial components |
| PLA | Bio-based, biodegradable, easy to print, low cost; heat-sensitive and moisture-sensitive | Needs consistent low-moisture handling; lower extrusion and tank temperatures (heating tank approx. 60°C); precise temperature control prevents degradation | Education, hobby printing, prototypes, visual models, disposable applications |
The filament line integrates with the full Chenxing materials ecosystem. Color masterbatches and blends are prepared in a high-speed mixer industrial mixer; off-spec and trial output is granulated with a plastic pelletizer or a PVC hot-cutting pelletizing line; lightweight scrap is densified with an agglomerator film densifier; and regrind is reduced with a plastic cruer. For a complete turnkey facility, the 990A Advanced Material Processing EPC Project engineers the entire material path around the filament process. The same extrusion engineering extends to adjacent markets: a PVC elf label strip extrusion line serves profile producers and a PVC UV marble eet making line serves decorative panel production — useful when a filament manufacturer diversifies into rigid extrusion products.
| Equipment | Best For | Difference from This Line |
|---|---|---|
| ABS/PETG/PLA 3D filament extrusion line (this page) | Mass production of standard ABS, PETG, PLA and engineering filament | Production-focused, three output models, stable tolerance and neat winding |
| Rainbow 3D printer filament extruder | Color-changing, multicolor, silk and luminous filament | Differentiated premium products; this page targets standard materials at production scale |
| SJ-25/25 laboratory mini single screw extruder | Single-layer formulation trials and small batch samples | R&D scale; this line is a complete production line for mass filament output |
| SJ-30/28 plastic co-extrusion laboratory extruder | Multilayer structure development on a lab scale | Co-extrusion R&D; this line is single-screw filament production |
| PETG pipe production line | Transparent copolyester pipe for food and medical applications | Large pipe profiles; this line produces fine 3D printer filament |
| PC LED light cover extrusion line | Optical PC/PMMA tubes with online precision cutting | Tube profiles; this line is filament-focused with laser diameter control |
| Parallel co-rotating twin screw extruder | Compounding and masterbatch production | Compounding tool feeding the filament process; this line is the finied-product line |
The line is designed for ABS, PLA, PC, PA, PET, PETG, PEI, PVA, PEEK, and other 3D printing materials. This page focuses on ABS, PETG, and PLA — the three main FDM market segments — and the line is configured around their different drying and cooling requirements, including material-matched heating tank temperatures (approximately 85°C for ABS and 60°C for PLA).
A single forged S136 die set produces multiple diameters — the conventional 1.75 mm and 3.0 mm, plus 2.0 mm and 2.85 mm. The laser controller holds dynamic tolerance to +/-0.02 mm on the SJ-45, with automatic feedback control; the SJ-35 holds 0.03 mm with tractor control. The die is dimensioned per the customer's sample, so the line is set up around the actual product.
Three mechanisms work together. First, the pellets are dried before extrusion — moisture is the main source of bubbles and voids. Second, the SJ main extruder delivers stable melting and extrusion with a homogeneous melt, eliminating color streaks and hollow material. Third, the forged S136 die with its special flow-dividing and pressure-boosting structure maintains uniform die pressure, keeping the strand solid and consistent. The finied product is free of bubbles, voids, and color differences.
Different materials cool, set, and release stress at different rates. The 4 m automatic circulation heating tank temperature is adjustable at its end and set per material — approximately 85°C for ABS and approximately 60°C for PLA — to prevent the strand from cooling too fast and becoming brittle. The 2 m SUS304 cooling tank then completes the gradual, stage-by-stage cooling that locks in roundness and prevents internal stress.
The single spool auto winder is driven by a servo motor control system with automatic metering, tension control, and automatic line arrangement. The 8 m storage device with a magnetic particle clutch (maximum 100 m line length, 0.75 kW motor) isolates tension during spool changeover. Constant tension from haul-off to spool, combined with automatic layer-by-layer line arrangement, produces neat, tangle-free spools that prevent kinking and tangling during printing.
Yes. The three-model series provides a natural expansion path: the SJ-25 (1–2 kg/h) serves laboratory and startup scale, the SJ-35 (8–12 kg/h) covers mid-range production, and the SJ-45 (20–25 kg/h) delivers industrial output — all at 30–100 m/min line speed. The line can also be equipped with an optional 3D printer plastic recycler that reclaims waste and off-spec filament, closing the material loop in-house.
Step 1 — Define Your Filament Portfolio: Tell Chenxing which materials you will produce — ABS, PETG, PLA, or the full range including PC, PA, PET, PEI, PVA, and PEEK — and the target diameters (1.75 mm, 2.0 mm, 2.85 mm, 3.0 mm). This determines the model, the die configuration, and the drying and cooling setup.
Step 2 — Choose the Production Model: Chenxing helps you select from the three series models by output target: the SJ-45 (20–25 kg/h, 40 kW, automatic feedback diameter control), the SJ-35 (8–12 kg/h, 30 kW, tractor control), or the SJ-25 (1–2 kg/h, 7 kW). The complete nine-module line is specified around your product: the SJ main extruder, the forged S136 die, the 4 m SUS304 heating tank and 2 m SUS304 cooling tank, the water sleeve dryers, the 8 m storage device, the +/-0.02 mm laser controller, the four-wheel haul-off, and the servo winder. Auxiliary drying, feeding, and granulation equipment — and the optional 3D printer plastic recycler — are specified on request.
Step 3 — Request a Quote from Nicole: Contact Nicole at +8615951187228 or ceo@cxsljx.com with your filament production project. Chenxing responds within 24 hours with a formal quotation, configuration list, and delivery schedule. The four-stage service then begins:
Pre-sales — in-depth communication based on your sample requirements and actual production workop, ensuring the product is targeted to your needs.
In production — your technical staff are welcome at the factory for supervision and guidance, and Chenxing reports progress to the project owner regularly.
Before ipment — Chenxing produces qualified product on the machine and ips only after you confirm it.
After ipment — installation technicians arrive on site once the machine arrives, and Chenxing engineers attend for guidance and training.
Step 4 — Start Mass Producing Reliable Filament: With the line commissioned and your staff trained, production begins: dried pellets in, neatly wound spools out — with stable tolerance reel after reel. The 990A Advanced Material Processing EPC Project is available if you want the complete production facility engineered around the line, and the rainbow 3D printer filament extruder extends the same platform into premium multicolor products. As a single-source partner, Chenxing Machinery supports your filament business from first spool to full production.
Contact Chenxing Machinery Today:
Contact Person: Nicole
Phone / WhatsApp: +8615951187228
Email: ceo@cxsljx.com
Company: Zhangjiagang Chenxing Machinery Co., Ltd.
Website: www.chenxingmachinery.com