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Product Description
A filament developer does not start with a 20 kg/h production line. Neither does a university lab, a filament start-up, or a 3D printing service bureau that wants to test a new color or a new formula before committing to volume. The problem is that most small extruders on the market are either too imprecise to be useful — diameters drift, roundness suffers, winding tangles — or too expensive for what they deliver.
What the lab and small-batch producer actually needs is a desktop-level filament extruder machine that is affordable enough to buy, precise enough to trust, and automatic enough to run without a full-time operator. It must validate a formula quickly, produce a few hundred grams for a customer sample, and scale the same recipe later — without re-learning a completely different process.
The Chenxing Mini 3D Printer Filament Extruder Machine (model SJ-25) is engineered for exactly this gap. It is a complete small plastic extrusion machine for 3D filament — main extruder, die, hot/cold water tank, puller, laser gauge, and winder — on a compact stainless steel desktop footprint. It produces 1–2 kg per hour of filament with perfect tolerance of ±0.03 mm, and even ±0.01 mm, runs under a PLC full-automatic control system, and comes with overseas installation service and low maintenance built in. It processes ABS, PLA, PA, HIPS, PET, and PETG — the materials most often tested and produced in small batches.
This page explains how the mini filament extruder works, what it includes, and how it compares with the full-scale filament line — so you can choose the right stage of automation for your business.
The mini 3D printer filament extruder machine is a complete six-module production chain. Every module is compact, but each plays the same role as on an industrial line: convert resin pellets into round, accurate, neatly wound filament.
The SJ-25 main extruder is the heart of the machine. A 0.75 kW drive turns the screw, transporting the pellets through three heating zones that melt the material progressively and homogenize it before the die. The small screw size and three-zone heating give the machine the thermal precision that small filaments demand: a stable melt is the precondition for a stable diameter. The machine is fed with dried pellets — for moisture-sensitive materials such as PETG and PA, pairing the mini extruder with a compact drying stage is recommended, using the STG-U hopper drier / plastic resin dryer, the 750A dehumidifying dryer where lower dew point is required, the 201A/J conveying integrated crystal dehumidification dryer for crystalline polymers, or the compact 530A crystal dryer for small-batch drying.
The melt is pued through the 1.75 mm and 3.0 mm mould, manufactured from 38CrMoAlA steel — a nitriding alloy known for wear resistance and long service life. The die is the dimension gate of the machine: it forms the strand at the target diameter before any downstream correction. One mould set serves both 1.75 mm (the FDM standard) and 3.0 mm, and the machine is capable of producing filament from 1.5 mm to 3.0 mm in diameter, so a lab can cover the main FDM sizes with one tool.
The strand enters the 800 mm two-stage water tank: a hot stage followed by a cold stage, driven by a 300 W water pump. The two-stage sequence cools the filament gradually — the hot stage relaxes the melt and prevents the strand from cooling too fast and becoming brittle, while the cold stage brings it to a stable temperature for measurement. This staged cooling protects roundness and prevents the internal stress that causes filament to break during printing. Tank temperature is adjusted per material, following the same principle used on the production line, where ABS runs approximately 85°C and PLA approximately 60°C in the heating stage.
The two wheels puller hauls the cooled filament away from the water tank at a controlled speed. The puller speed, together with extruder output, determines the final diameter — increasing pull speed thins the filament, decreasing it thickens the strand. The puller is the mechanical actuator of the diameter control loop and keeps the line moving steadily through measurement and winding.
The Laser X gauge measures the filament diameter dynamically as it passes. Combined with the control system, it holds the diameter to ±0.03 mm, and even ±0.01 mm — precision that lets the user verify a formula or a color masterbatch with confidence. The measurement also drives the small corrections that keep the finied spool consistent from start to end.
At the end of the chain, the single spool winder winds the finied filament onto a spool with 0.3 N constant tension. Consistent tension and tidy layering mean the spool feeds cleanly into a printer — the same neat winding principle as the industrial line, scaled to small spools. The finied product is ready for customer sampling or small-batch sale.
The complete process chain — main extruder → mould → hot/cold water tank → two wheels puller → laser gauge → single spool winder — is a full mini filament line on a single desktop footprint, not a bare extruder that leaves you to solve cooling, measuring, and winding yourself.
| Parameter | Value |
|---|---|
| Model | SJ-25 Main Extruder |
| Extruder motor | 0.75 kW |
| Capacity | 1–2 kg per hour |
| Heating zones | 3 |
| Die material | 38CrMoAlA |
| Die diameters | 1.75 mm and 3.0 mm |
| Produced filament diameter | 1.5 mm – 3.0 mm |
| Hot and cold water tank | 800 mm length, two stages (hot + cold), 300 W water pump |
| Puller | Two wheels puller |
| Diameter measurement | Laser X gauge |
| Winder | Single spool winder, 0.3 N tension |
| Tolerance | ±0.03 mm, even ±0.01 mm |
| Control system | PLC full-automatic control system |
| Body | New stainless steel body, corrosion-resistant |
| Materials | ABS, PLA, PA, HIPS, PET, PETG |
| Certification | CE |
Parameters not own on the source page — such as screw diameter, L/D ratio, total power, heating power per zone, machine dimensions, weight, and voltage — 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: The Laser X gauge measures filament diameter dynamically and the control loop holds tolerance to ±0.03 mm, and even ±0.01 mm.
Advantage: Diameter drift and ovality are caught and corrected during production, not discovered after the spool is packed.
Benefit: A lab or start-up can present measured, verifiable filament quality to customers and printers — the trust that wins the first order and the repeat order.
Feature: The SJ-25 delivers 1–2 kg per hour — a higher capacity than other suppliers using the same model class.
Advantage: The same desktop footprint produces more usable filament per ift, so tests fini faster and sample orders ip sooner.
Benefit: More output from the same small investment ortens the payback period for a testing machine and makes small-batch production practical.
Feature: The machine runs on a PLC full-automatic control system that manages the extrusion process with minimal manual intervention.
Advantage: Temperature, pull speed, and winding work as a coordinated automatic sequence rather than a set of manual adjustments.
Benefit: A single operator — or a student, researcher, or entrepreneur without extrusion experience — can run consistent trials after a ort training session.
Feature: The mini extruder processes ABS, PLA, PA, HIPS, PET, and PETG, with material-matched temperature settings.
Advantage: One desktop machine covers the most common FDM materials, from easy-print PLA to engineering ABS and PA.
Benefit: A lab validates the full range of its product portfolio without buying a different machine per material.
Feature: The machine features a new stainless steel body that is more corrosion-resistant than painted steel.
Advantage: Water tanks, spla zones, and frames resist corrosion from water and material contact, keeping the machine clean and presentable.
Benefit: Lower maintenance, longer appearance life, and a professional look in a laboratory or owroom environment.
Feature: The machine is designed for low maintenance; Chenxing reports no maintenance complaints after the machine has been running.
Advantage: Fewer spare parts to stock, less downtime, and no hidden running costs.
Benefit: The total cost of ownerip stays low — the machine works, and the operator's time goes into filament development, not repairs.
Feature: The machine produces filament from 1.5 mm to 3.0 mm in diameter, with a die set covering 1.75 mm and 3.0 mm.
Advantage: One machine serves standard 1.75 mm FDM filament, 2.85 mm filament, and specialty 1.5 mm or 3.0 mm products.
Benefit: The same desktop investment opens several market segments instead of locking the user into one diameter.
Feature: Chenxing provides installation services overseas, with engineers available for on-site setup and training.
Advantage: The machine is commissioned correctly the first time, wherever the buyer is located.
Benefit: No integration risk, no trial-and-error commissioning — the mini extruder is producing verified filament within days of arrival.
The Chenxing range covers the complete filament production journey, from a desktop testing machine to a mass-production line. Choosing the right stage saves money; choosing the wrong one wastes it.
| Comparison | Mini 3D Printer Filament Extruder (this page) | ABS/PETG/PLA 3D Filament Extrusion Line |
|---|---|---|
| Model | SJ-25 | SJ-45 SJ-35 SJ-25 |
| Output | 1–2 kg/h | 1–25 kg/h (SJ-45: 20–25 kg/h) |
| Configuration | 6 modules (extruder, mould, water tank, puller, laser, winder) | 9 modules (extruder, die, 4 m heating + 2 m cooling tanks, dryers, 8 m storage, laser, haul-off, winder) |
| Diameter tolerance | ±0.03 mm, even ±0.01 mm | ±0.02 mm (SJ-45) |
| Line speed | Desktop scale | 30–100 m/min |
| Best for | Filament testing, R&D, teaching, small-batch production, samples | Mass production of ABS/PETG/PLA and engineering filament |
| Investment | Low entry | Higher, matched to volume |
| Typical user | Lab, start-up, university, service bureau | Filament manufacturer, growing producer |
The selection logic is simple:
If you are developing formulas, testing colors, teaching, or supplying small sample quantities — start with the mini 3D printer filament extruder machine own on this page. It is fast to commission, cheap to run, and precise enough to validate products that can later scale.
If you are producing filament for sale at volume — step up to the ABS/PETG/PLA 3D filament extrusion line, which adds industrial drying, an 8 m storage buffer, a ±0.02 mm laser loop, and servo winding for 20–25 kg/h output.
If you want premium differentiated products — the same SJ platform extends to the rainbow 3D printer filament extruder for multicolor, silk, and luminous filament.
If your lab also works on profile or compounding projects — the parallel co-rotating twin screw extruder handles compounding and masterbatch, the PETG pipe production line and the PC LED light cover extrusion line cover rigid tube and profile extrusion, and the PVC elf label strip extrusion line and PVC UV marble eet making line extend the same know-how into PVC products.
For pure resin-to-compound work before filament extrusion, Chenxing also offers the SJ-25/25 laboratory mini single screw extruder and the SJ-30/28 plastic co-extrusion laboratory extruder; these are general extrusion tools, while the mini filament extruder on this page is a complete dedicated filament line with laser measurement and winding built in. Around the filament machine, a complete auxiliary set completes the lab loop: blends and masterbatches are prepared in a high-speed mixer industrial mixer, pellets are conveyed with a VLF powder suction machine, a FSP cruing material suction machine, or a screw feeder automatic feeding machine, ferrous contamination is removed by a CJ magnetic frame hopper magnet, and trial waste is reclaimed with a plastic cruer, an agglomerator film densifier, or a PVC hot-cutting pelletizing line.
The machine processes ABS, PLA, PA, HIPS, PET, and PETG, with the page's product description also confirming PETG among the supported materials for filament testing and production. Temperature settings are matched to the material, following the same staged-cooling principle used on the production-scale line (for example, ABS runs warmer and PLA cooler in the water stage). For materials that require strict drying, pair the machine with a STG-U hopper drier / plastic resin dryer or a 750A dehumidifying dryer.
The machine produces filament from 1.5 mm to 3.0 mm in diameter, with a die set covering the two most common sizes — 1.75 mm and 3.0 mm. The Laser X gauge holds the diameter to ±0.03 mm, and even ±0.01 mm, depending on material and running conditions. This covers standard FDM sizes as well as specialty diameters for testing.
Yes. The machine runs on a PLC full-automatic control system, so temperature, pull speed, and winding operate as a coordinated automatic sequence. A single operator — a researcher, student, or entrepreneur without extrusion experience — can run consistent trials after a ort training session, and Chenxing's overseas installation service includes on-site setup and operator guidance.
Yes. With 1–2 kg/h output, the SJ-25 supports small-batch production as well as testing. It can fill a customer sample order, supply a small retail range, or cover specialty diameters in low volume. When demand grows, the same material recipes can be scaled to the ABS/PETG/PLA 3D filament extrusion line for 20–25 kg/h mass production.
The standard configuration includes six modules: the SJ-25 main extruder (0.75 kW, 3 heating zones), the 1.75 mm and 3.0 mm mould (38CrMoAlA), the 800 mm two-stage hot and cold water tank with 300 W pump, the two wheels puller, the Laser X diameter gauge, and the single spool winder with 0.3 N tension. It is a complete mini filament line — nothing extra is required to start testing.
Yes. Overseas installation service is one of the machine's core advantages. Chenxing's four-stage service covers pre-sales communication, in-production supervision visits, pre-ipment product confirmation, and after-ipment installation with engineers on site for guidance and training (remote guidance is provided where on-site visits are not possible). Contact Nicole at +8615951187228 or ceo@cxsljx.com to arrange installation for your location.
Step 1 — Define Your Testing and Production Needs: Tell Chenxing which materials you will run — ABS, PLA, PA, HIPS, PET, or PETG — and which filament diameters you need (1.75 mm, 3.0 mm, or specialty sizes between 1.5 mm and 3.0 mm). This determines the die configuration and the temperature setup for your first trials.
Step 2 — Confirm the SJ-25 Configuration: Chenxing specifies the standard six-module package around your materials: the SJ-25 main extruder (0.75 kW, 3 heating zones), the 38CrMoAlA mould for 1.75 mm and 3.0 mm, the 800 mm two-stage water tank with 300 W pump, the two wheels puller, the Laser X gauge, and the single spool winder at 0.3 N tension. Auxiliary drying and granulation equipment — and the choice of plastic pelletizer or plastic cruer for reclaiming trial waste — are specified on request.
Step 3 — Request a Quote from Nicole: Contact Nicole at +8615951187228 or ceo@cxsljx.com with your project details. 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 (remote guidance where on-site visits are not possible).
Step 4 — Start Testing and Producing Reliable Filament: With the machine commissioned and your staff trained, the SJ-25 is ready: pellets in, neatly wound spools out — at ±0.03 mm tolerance, from a stainless steel desktop machine that fits a lab bench. As your volumes grow, Chenxing supports the next step — the ABS/PETG/PLA 3D filament extrusion line for mass production, or a complete turnkey facility through the 990A Advanced Material Processing EPC Project. A filament business grows stage by stage — and Chenxing provides the machine at every stage. As a single-source partner, Chenxing Machinery supports you from the first test spool to full-scale 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
