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Product Description
Commodity single-color filament is a race to the bottom. The market is crowded, margins are thin, and every desktop printer spool looks like the last. Meanwhile, the parts that get noticed — and the brands that get premium prices — are printed in materials that a standard spool cannot deliver: color-changing filament that shifts with heat, multicolor rainbow filament for rainbow printers, silk PLA rainbow filaments with a pearlescent sheen, and luminous rainbow filaments that glow in the dark.
That is the opportunity the Chenxing Rainbow 3D Printer Filament Extruder Machine is built to capture. It is a complete 3D filament extrusion line designed around differentiated rainbow products — the materials that command higher value per kilogram and build recognizable brands. The line combines a 45 mm single screw extruder, a high-precision S136 extrusion die that produces multiple filament diameters from one tool, laser diameter control within +/-0.02 mm, and constant-tension servo winding — the discipline that turns a molten strand into a neatly wound, print-ready rainbow spool.
But differentiated filament is unforgiving. A color transition is only valuable if the diameter stays true through the transition; a silk sheen is only premium if the surface is flawless; a luminous spool is only usable if the winding is clean. The rainbow extrusion line is engineered around exactly those failure points — the heating tank temperatures are matched to the material, the haul-off is synchronized with the extruder, and the winder runs on closed-loop tension from the first meter to the last.
The Rainbow 3D printer filament extruder is a complete, nine-module 3D filament production line. Each module has a specific job, and together they convert dried pellets into finished rainbow filament ready for the printer.
Rainbow filament raw materials — PLA, PET, and ABS — are hygroscopic: moisture absorbed from the air turns into steam inside the barrel, causing bubbles, surface defects, and diameter variation. Before extrusion, the pellets are dried to the moisture level required by the material. For the highest drying discipline, the line works 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 crystalline-polymer duties, and the STG-U hopper drier / plastic resin dryer is the general-purpose option for non-critical resins.
The dried pellets are fed into the hopper of the 45 mm single screw extruder. For controlled, consistent dosing, the line integrates with the Chenxing feeding range: the VLF powder suction machine and the VLF-L continuous powder suction machine transfer powder materials, the FSP crushing material suction machine handles regrind and crushed material, and the screw feeder automatic feeding machine delivers precise volumetric dosing for pellets. Magnetic protection at the feed throat comes from a CJ magnetic frame hopper magnet, removing ferrous contamination before it reaches the screw.
The heart of the line is the SHSJ-45 single screw extruder, a 45 mm screw. The rotating screw transports the plastic forward, compacting, melting, and mixing it into a homogeneous melt. For rainbow filament, melt uniformity matters twice: any unmelted particle or viscosity fluctuation shows up as a diameter spike downstream, and the color masterbatch must be dispersed evenly through the melt for a consistent color transition. The screw geometry is matched to the material being processed, and the barrel zones are heated to the temperature profile required by that material — for heat-sensitive polymers, precise zone control prevents degradation that would cloud the color.
The melt is pushed through the high-precision extrusion die, manufactured from S136 steel. The die is dimensioned according to sample size — customized to the customer's target product — and a single die produces multiple diameters: the conventional 1.75 mm and 3.0 mm filament, plus 2.0 mm and 2.85 mm, from the same tool. The S136 steel provides the corrosion resistance and wear resistance needed to keep the die land dimensionally stable across long production runs — the die is the first gate that determines whether the filament starts at the right diameter.
The hot strand leaves the die and passes through the 4-meter automatic circulation heating tank, built in SUS304 stainless steel. The tank temperature is set according to the raw material — for example, approximately 85°C for ABS and approximately 60°C for PLA — to control the cooling rate of the strand as it begins to set. The heating tank is followed by a 2-meter cooling water tank, also in SUS304 stainless steel, which completes the cooling and locks in the roundness and diameter of the filament. The staged heating-then-cooling sequence is critical for rainbow filament: it controls crystallization and stress in the strand, preventing ovality and internal stress that would later cause warping or poor layer adhesion in the printed part.
Two drying devices with special water sleeve rings are positioned along the line to wipe and dry the surface of the filament as it travels through the water stages. A dry, clean surface is essential before laser measurement: water droplets or surface moisture would scatter the laser and produce false diameter readings. The water sleeve rings also stabilize the strand path, keeping the filament centered as it moves toward the measuring head.
The filament then travels through the 8-meter storage device, which accommodates a maximum line length of 100 meters. The storage section provides the buffer and travel path that allow the strand to relax and stabilize before measurement and winding. Tension control is provided by a magnetic particle clutch, which applies smooth, adjustable braking force — the foundation of the constant-tension discipline that protects the filament from stretching or slackening between the haul-off and the winder.
A laser controller continuously measures the diameter of the moving filament, holding tolerance to +/-0.02 mm. The measurement feeds the closed-loop control of the line: as the measured diameter deviates from the set value, the puller speed and extruder output are corrected in real time. For rainbow filament, this is the most important module — the entire commercial value of the product depends on the diameter being true through the color transition, from the first color band to the last.
The four-wheel haul-off device pulls the filament forward at the speed commanded by the control loop. It is built with precision guide pillars for accurate tracking, and the traction surface uses multi-wedge belts with abrasion-resistant surfaces that grip the filament without marking or stretching it. The haul-off is controlled by a frequency inverter, giving smooth speed adjustment that stays synchronized with the extruder output — the second half of the diameter control loop.
At the end of the line, the single spool auto winder winds the finished filament onto spools. It is driven by a servo motor control system and provides automatic metering — the total length produced is counted before winding — plus tension control and automatic cable winding (automatic line arrangement). The result is a neatly wound spool, layer by layer, without tangles, crossovers, or stress-induced deformation — exactly what a printer user needs for trouble-free feeding. The finished product can be neatly wound, ready for vacuum packaging and shipment.
| # | Item | Qty | Remarks |
|---|---|---|---|
| 1 | SHSJ-45 Single Screw Extruder | 1 set | 45 mm single screw extruder |
| 2 | High-Precision Extrusion Die | 1 set | Die steel S136; size customized per sample; one die produces 1.75 mm 3.0 mm 2.0 mm / 2.85 mm filament |
| 3 | 4 m Automatic Circulation Heating Tank | 1 set | SUS304 stainless steel; temperature set per material (ABS approx. 85°C, PLA approx. 60°C, etc.) |
| 4 | 2 m Cooling Water Tank | 1 set | SUS304 stainless steel |
| 5 | Drying Device | 2 sets | Special water sleeve ring |
| 6 | 8 m Storage Device | 1 set | Tension control (magnetic particle clutch); max line length 100 m |
| 7 | Laser Controller | 1 set | Tolerance +/-0.02 mm |
| 8 | Four-Wheel Haul-Off Device | 1 set | Precision guide pillars; multi-wedge belt abrasion-resistant traction; frequency inverter control |
| 9 | Single Spool Auto Winder | 1 set | Automatic metering; tension control; automatic line arrangement; servo motor control |
| Parameter | Value |
|---|---|
| Main extruder screw diameter | 45 mm (single screw) |
| Filament diameters | 1.75 mm 2.0 mm 2.85 mm / 3.0 mm from one die |
| Laser diameter tolerance | +/-0.02 mm |
| Heating tank temperature | Set per material: ABS approx. 85°C, PLA approx. 60°C |
| Storage line length | Max 100 m (8 m storage device, magnetic particle clutch tension) |
| Die steel | S136 |
| Tank material | SUS304 stainless steel |
| Winder drive | Servo motor, automatic metering, tension control, automatic line arrangement |
| Design materials | PLA, PET, ABS |
| Filament products | Color-changing filament, multicolor rainbow filament, silk PLA rainbow filament, luminous rainbow filament |
Parameters not provided on the source page — output capacity (kg/h), motor power, heating power, line speed, screw L/D, and overall dimensions — are customized to the rainbow filament project and are available on request from the Chenxing engineering team. The latest commercial quotation is available on request; pricing, MOQ, and lead time are confirmed by the sales team for each project.
Feature: A complete filament extrusion line designed specifically for color-changing filament, multicolor rainbow filament, silk PLA rainbow filament, and luminous rainbow filament.
Advantage: The processor enters the high-value segment of the 3D printing materials market, where differentiated products command premium prices.
Benefit: Higher margin per kilogram, a recognizable brand, and products that desktop and prosumer printers cannot get from standard spool suppliers.
Feature: A single high-precision S136 die is customized per sample and produces the conventional 1.75 mm and 3.0 mm filament plus 2.0 mm and 2.85 mm from the same tool.
Advantage: One line serves the full diameter range of the FDM market without changing dies for each size; the S136 steel keeps the die land dimensionally stable over long runs.
Benefit: Flexible production planning, lower tooling investment, and fast response to whichever diameter the market demands.
Feature: A laser controller continuously measures the filament diameter, holding tolerance to +/-0.02 mm, with real-time correction of puller speed and extruder output.
Advantage: Diameter spikes, ovality, and drift are caught and corrected while the line is running — including through color transitions where viscosity changes are most likely.
Benefit: Print-ready filament with consistent flow in the hot end: fewer clogs, fewer failed prints, and a reputation for reliability.
Feature: A 4 m automatic circulation heating tank (SUS304) whose temperature is set per material — approximately 85°C for ABS and 60°C for PLA — followed by a 2 m SUS304 cooling tank.
Advantage: The cooling rate of each material is controlled, protecting roundness and preventing internal stress and crystallization defects.
Benefit: Smooth, round, stress-free filament in every material — the foundation of dimensional accuracy and good print quality.
Feature: The single spool auto winder is servo-motor controlled with automatic metering, tension control, and automatic line arrangement; the 8 m storage device adds magnetic particle clutch tension control across a 100 m maximum line length.
Advantage: Tension is held constant from the haul-off to the spool, and the line is laid automatically, layer by layer.
Benefit: Tangle-free, stress-free spools that feed the printer reliably to the last meter — the finishing quality that end users see first.
Feature: The extrusion die is manufactured from S136 steel and the water tanks are built from SUS304 stainless steel.
Advantage: Corrosion resistance and wear resistance keep the wetted and process-contact parts clean and dimensionally stable over long production runs and frequent color changes.
Benefit: Consistent product quality, simple cleaning between color batches, and a longer service life for the line.
Feature: Chenxing supports every rainbow filament project in four stages: pre-sales communication on sample requirements and workshop layout; in-production factory inspection and progress reporting; pre-shipment acceptance with qualified product produced on the machine; and post-shipment installation and on-site engineer training.
Advantage: The line is built around the customer's actual product, verified before shipment, and commissioned by Chenxing engineers at the customer's plant.
Benefit: Fast start-up, a line that produces the customer's rainbow products from day one, and a team that stays with the project until it runs.
The rainbow filament line is designed to process PLA, PET, and ABS — the workhorse materials of the FDM market:
PLA — bio-based, low-cost, and easy to print; the base of silk PLA rainbow filament and PLA rainbow filament with its vivid color transitions.
PET — tough and transparent; used where mechanical strength and chemical resistance are needed in functional rainbow products.
ABS — strong and heat-resistant; used for engineering-grade parts where the rainbow effect is a design feature on a functional surface.
The Rainbow 3D printer filament extruder is mainly used for producing 3D printing materials such as:
Color-changing filament — filament whose color shifts with temperature, light, or viewing angle, for novelty and functional indicator parts.
Multicolor rainbow 3D printer filament — filament with a continuous color transition along the strand, designed for rainbow printers and single-hot-end multicolor effects.
Silk PLA rainbow filaments — silk-finish PLA with a pearlescent, satin surface and rainbow color flow, popular for decorative prints.
PLA rainbow filaments — vivid multicolor PLA for visual parts, prototypes, and art prints.
Luminous rainbow filaments — rainbow filament with glow-in-the-dark capability for signage, safety markers, and decorative parts.
The differentiated products from this line serve a wide range of industries, including:
Medical — anatomical models, surgical planning aids, and patient communication models in biocompatible-friendly materials.
Automotive — concept models, jigs and fixtures, and decorative interior prototypes where color and finish matter.
Aerospace — design verification models and lightweight structural prototypes that demand dimensional accuracy.
Daily necessities — home decor, toys, wearables, and consumer goods where the rainbow effect is the selling point.
| Equipment | Best For | Difference from This Line |
|---|---|---|
| Rainbow 3D printer filament extruder (this page) | Color-changing, multicolor, silk and luminous 3D filament | Differentiated rainbow products, one die for 1.75–3.0 mm, +/-0.02 mm laser control, servo winding |
| SJ-25/25 laboratory mini single screw extruder | Single-layer formulation trials and small batch samples | Laboratory scale for R&D; this line is a complete production line for rainbow products |
| SJ-30/28 plastic co-extrusion laboratory extruder | Multilayer structure development on a lab scale | Co-extrusion R&D platform; this line is a single-screw production line for 3D filament |
| PETG pipe production line | Transparent copolyester pipe production | Large pipe profile; this line produces fine 3D printer filament |
| PC LED light cover extrusion line | Optical PC/PMMA tube production | Tube profile with precision cutting; this line is filament-focused with laser diameter control |
| Parallel co-rotating twin screw extruder | Compounding and masterbatch production | Compounding tool; this line is a finished-product filament line |
The rainbow filament line works best inside a complete materials ecosystem. Color masterbatches are blended and dispersed in a high-speed mixer industrial mixer before extrusion; trial and off-spec output is granulated with a plastic pelletizer or a PVC hot-cutting pelletizing line; film and lightweight scrap is densified with an agglomerator film densifier; and regrind is reduced with a plastic crusher. The PVC shelf label strip extrusion line, PVC UV marble sheet making line, and PC LED light cover extrusion line show the same extrusion discipline applied to other premium profiles. For a complete turnkey production facility, the 990A Advanced Material Processing EPC Project engineers the entire material path around the rainbow filament process.
The Rainbow 3D printer filament extruder is a 3D filament extrusion line mainly used for producing differentiated 3D printing materials such as color-changing filament, multicolor rainbow 3D printer filament for rainbow printers, silk PLA rainbow filaments, PLA rainbow filaments, and luminous rainbow filaments. It is a complete production line — from drying and extrusion to laser measurement and automatic winding — for manufacturers who want to enter the premium rainbow filament segment.
A single high-precision S136 die produces multiple diameters: the conventional 1.75 mm and 3.0 mm filament, plus 2.0 mm and 2.85 mm — all from the same die. The die size is customized according to the customer's sample requirements, so the line is set up around the product the manufacturer actually sells.
The line is a closed loop. A laser controller continuously measures the moving filament, holding tolerance to +/-0.02 mm. When the measured diameter deviates from the set value, the control system corrects the four-wheel haul-off speed — driven by a frequency inverter with precision guide pillars and abrasion-resistant multi-wedge belts — in real time, in synchronization with extruder output. Water sleeve ring dryers keep the surface dry before measurement so the laser reading is always accurate.
Yes. The line is specifically designed for these differentiated products: color-changing filament, multicolor rainbow filament for rainbow printers, silk PLA rainbow filaments, PLA rainbow filaments, and luminous rainbow filaments. Color masterbatch is dispersed through the 45 mm single screw extruder's melting section, and the material-matched heating tank temperatures (approximately 85°C for ABS, 60°C for PLA) protect the color and finish through the cooling process.
Different materials set, crystallize, and release stress at different rates. A heating tank temperature of approximately 85°C suits ABS, while approximately 60°C suits PLA; the 4 m automatic circulation heating tank is set per material to control the cooling rate, followed by the 2 m SUS304 cooling tank to complete solidification. Correct staged cooling keeps the filament round, stress-free, and dimensionally stable — the foundation of good print quality and low warpage in the printed part.
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 (up to 100 m line length) provides the upstream tension buffer. Constant tension from haul-off to spool, combined with automatic layer-by-layer line arrangement, produces neatly wound spools without tangles, crossovers, or stress-induced deformation — the finished product can be neatly wound and ready for packaging.
Step 1 — Share Your Rainbow Product Vision: Tell us which products you want to produce — color-changing, multicolor rainbow, silk PLA rainbow, or luminous rainbow filament — and the target diameters (1.75 mm, 2.0 mm, 2.85 mm, 3.0 mm). Chenxing will confirm the die configuration, the material set, and the tank temperature program for your products.
Step 2 — Review the Line Configuration: Chenxing specifies the complete nine-module line around your sample: the SHSJ-45 45 mm single screw extruder, the S136 die customized per sample, the 4 m SUS304 heating tank and 2 m SUS304 cooling tank, the two water sleeve drying devices, the 8 m storage device with magnetic particle clutch, the +/-0.02 mm laser controller, the four-wheel haul-off, and the servo-driven single spool auto winder. Output capacity, line speed, and auxiliary drying and feeding equipment are specified on request.
Step 3 — Request a Quote from Nicole: Contact Nicole at +8615951187228 or ceo@cxsljx.com with your rainbow filament 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 workshop, 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 shipment — Chenxing produces qualified product on the machine and ships only after you confirm it.
After shipment — installation technicians arrive on site once the machine arrives, and Chenxing engineers attend for guidance and training.
Step 4 — Start Producing Premium Rainbow Filament: With the line commissioned and your staff trained, production begins: dried pellets in, neatly wound rainbow spools out. The 990A Advanced Material Processing EPC Project is available if you want the complete production facility engineered around the line — from the high-speed mixer and dryers through to granulation and recycling. As a single-source partner, Chenxing Machinery supports your rainbow filament business from first sample 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
