Paraffin Wax Heated Hose for 3D Printers (JCH)

JCH is the electrically heated hose our catalog lists for 3D printing equipment: a heated, insulated line that keeps paraffin wax molten on its way to the machine. The catalog calls it the 3D printer wax hose, and it sits in the low-temperature, low-pressure group of the heated range. Maximum heat resistance is up to 230 °C (446 °F), and higher temperatures are custom on request. The catalog prints seven bore sizes for this product, 1/4" to 1".

• Max heat resistance230 °C / 446 °F, higher on request
• Pressure classlow pressure, per-size table below
• Bore1/4"–1" (7 sizes)
• Supply110 / 220 / 380 Vac, 12 Vdc
• SensorJ, K, Ni120, PT100, PT1000

Overview

A common failure on wax lines is not a burst or a failed heater element but a line that stops feeding: flow at the nozzle falls away because wax has set inside the hose. A plug of this kind tends to form where the path runs coldest, which on most lines is the last stretch before the nozzle or the fitting itself rather than the middle of the run.

Wax does that. It is solid at room temperature and only stays liquid while every part of the path is above its melt point, so a wax line is a heat problem from the melter all the way to the nozzle, not just in the body of the hose. The places that cool first are the ends: the fitting that screws into the printer, the short section between the lead exit and the machine, and any length hanging free where air can move past it. If the heating layer puts in less heat near the fittings than it does in the middle, the controller's sensor reads an average and the ends run cold. That is why this build uses a heating layer of uniformly braided heating elements — the aim is a small temperature difference along the inner wall rather than a hot middle and cold ends. The insulation is chosen from high-insulation-efficiency materials with surface temperature in mind, so the hose does not lose on the outside the heat it needs inside.

Restarting is the other half of the job. When the heater goes off, the wax in the bore sets, and on the next start the run has to come back up before anything pushes material through it. General practice on a wax line is to bring the whole run up to temperature and give it time to soak before pressurising, to keep the sensor where it sees the material rather than the element, and to avoid one zone being hot while the next is still solid. Treat those as maintenance habits, not as catalog data; your melt point, your setpoints and your printer's own heating sequence decide them.

What the hose is: a heated transfer line from the low-pressure group, with per-size ratings in the table below, built to match the customer's printer, and updated over successive generations as customers' printer models and technology have been upgraded. What it is not: a metering device, or a line for sticky high-pressure sealants, or an adhesive hose. If the material is a hot-melt adhesive, the hot-melt build is the closer match; if the line is a high-pressure glue pump, look at the sealant dispensing hose. The bore, the length and the fittings are chosen around the material and the machine.

Specifications

All values as printed in the Jingcheng 2025 electrically heated hose catalog.

Size and pressure table

All values as printed in the Jingcheng 2025 electrically heated hose catalog.

Full catalog: Heated hose catalog (PDF, 4.9 MB)

Materials and construction

• Inner tube: specified on the order form by model-code letter – B stainless corrugated tube, TB PTFE hose with stainless braid, T PTFE hose, X special material. Which one suits a wax line depends on the melt point, how the line is cleaned out and the printer it feeds; tell us those and we will propose the tube.
• Heating layer: heating elements braided uniformly around the hose, to minimise differences in temperature distribution along the inner wall.
• Insulation: high-insulation-efficiency material, selected with surface temperature in mind.
• Outer surface: the hoses in the photo have a yellow textured outer cover. The catalog page does not name the cover material, so it is specified on the drawing for your machine rather than guessed from a picture.
• Sensor: a temperature sensor in the assembly, matched to your controller. Type J or K, Ni120, PT100 or PT1000, agreed on the drawing.
• End fittings and leads: a metal fitting at each end, and an electrical lead exiting near one end – on the photo hose the lead end is wrapped in black tape, with the leads and small connectors visible, and the other end finishes in a short black end cap with a label. Thread standard and size are specified per end.

Temperature and pressure notes

230 °C (446 °F) is the maximum heat resistance printed for this product; the catalog marks higher temperatures as custom, on request. The catalog places this hose in the low-temperature, low-pressure group of the heated range. That is a grouping of the range, not a 100 °C ceiling — other products in the same group are printed at different maximums, and the figure for this hose is 230 °C. The useful number for your line is the setpoint the wax needs at the nozzle, which is normally below it.

Pressure is given per size in the table above, from 173 bar working at 1/4" down to 75 bar at 1". These are the hose ratings printed for the T-STD rows; the rating of the finished assembly is confirmed on the quotation drawing. The per-size minimum bend radii run from 30 mm at 1/4" to 300 mm at 1". The catalog order form lists pressure steps of 4, 10, 20 and 35 MPa, or other. Send the pressure the pump or melter actually reaches, including any pulse, and the tightest bend on the route.

Keep the ambient inside −40 to +55 °C (−40 to 131 °F) at 85 % relative humidity or less and 86–106 kPa, and keep the surroundings free of gases that corrode metal or damage insulation, of conductive media and of severe mould; anything outside that is a custom build. Only trained personnel should operate the hose, and modification not agreed with us voids the warranty. Do not twist the hose laterally during or after installation. Surface temperature is part of the build, but the hose still gets warm in service — route it where nothing that minds heat will rest against it.

Applications

The catalog application is 3D printing equipment. In practice that covers:

• Wax or paraffin supply lines on 3D printing equipment
• Machines where the run has to stay liquid through idle periods between jobs
• Printer builds where the fittings at each end and the lead exit have to follow the machine, not a standard hose
• Wax handling on equipment that is being updated, where the hose has to match the new machine rather than the old one

It is not the right hose for a hot-melt adhesive machine, which has its own build — see the hot-melt hose. Nor for a high-pressure glue or sealant pump, where the hose has to take the pump's pulses — that is the sealant dispensing build. And it will not hold a nozzle temperature on its own: the assembly carries a sensor, and the controller has to be set up for the material.

Options and related builds

• Before you specify: the heated hose specification checklist lists the inputs we need for a quotation, in the order we ask for them.
• Same table, adhesive duty: for hot-melt and PUR adhesive machines see the hot-melt adhesive hose, which is listed on the same T-STD rows, 1/4"–1".
• Low temperature, higher pressure: the automotive sealant dispensing heated hose is the low-temperature, high-pressure build for glue and sealant pumps.
• Other heated builds: browse the Low-Temperature Heated Hose — Low Pressure and Heated Low Pressure Hose families.

How to order

A JCH part number carries the main choices, so the fastest way to order is to quote one. The catalog example is JCH-200-16-B-3X220-P2-8:

1. 200 – working temperature in °C. 200 means 200 °C.
2. 16 – inner tube bore in mm. 16 means Φ16 mm.
3. Inner tube letter – B is a stainless corrugated tube, TB is PTFE hose with stainless braid, T is a PTFE hose, X is a special material.
4. Supply – 220 means 220 V, 3X220 means three-phase four-wire 220 V.
5. Sensor code – P2 is PT100 two-wire, P3 is PT100 three-wire, K is type K, J is type J, W is no sensor, T is a special sensor.
6. Pressure – working pressure in MPa. 8 means 8 MPa.

If you do not have a part number, send these instead:

1. Bore and length, the number of pieces, and the distance the line has to cover on the machine.
2. The wax or paraffin you run, its melt point and the temperature you want at the nozzle.
3. The setpoint you want and the highest ambient the run passes through.
4. Supply voltage and the controller or cabinet the hose plugs into.
5. Sensor type and wiring, if the cabinet dictates it, plus the pin table if one exists.
6. End fittings at each end: thread standard, size, angle, with a photo or part number if you have one.
7. The route – how the hose is supported at the printer and at the melter, and the tightest bend on it.

If a drawing exists, send it. We propose the specification against it, you confirm it with the quotation, and production follows the confirmed specification.

Frequently asked questions

What is a wax heated hose for 3D printers?

A heated, insulated hose for 3D printing equipment that carries paraffin wax from the supply point to the machine while keeping it liquid. It combines a heated inner hose, a braided heating layer, insulation, an outer cover, a metal fitting at each end and an electrical lead. The catalog lists it as the 3D printer wax hose, in the low-temperature, low-pressure group.

What temperature does it run at?

Maximum heat resistance is up to 230 °C (446 °F), with higher temperatures custom on request. The low-temperature grouping does not cap the hose at 100 °C — the figure for this product is 230 °C. Order the setpoint the wax needs at the nozzle, not the maximum of the hose.

Which bores are available?

Seven are printed for this product: 1/4", 5/16", 3/8", 1/2", 5/8", 3/4" and 1". The order form also lists Φ8, Φ12, Φ16, Φ19 and Φ25 mm with an "other" option for the JCH range.

How much pressure does it take?

The catalog places it in the low-temperature, low-pressure group; it is not one of the heated high-pressure builds. Per-size working and burst pressures are printed in the table above, from 173 bar working at 1/4" to 75 bar at 1"; the rating of the finished assembly is confirmed on the quotation drawing. Send the pressure the melter or pump actually reaches, including any pulse, when you enquire.

Will the wax set in the hose when the printer is off?

Yes — wax solidifies below its melt point, so a cold run will set. Keeping the hose heated end to end, bringing the whole run up to temperature before pushing material on restart, and placing the sensor where it sees the material are general practice on wax lines. The hose cannot do that on its own; the controller and the machine's heating sequence do.

Can it be supplied with my printer's fittings and controller?

Yes. Both ends are specified separately on the order – US, British or metric threads, or another type – and made to order. The sensor is matched to your controller: type J or K, Ni120, PT100 or PT1000, with PID control and SSR or thyristor output on our controllers.

Source: Jingcheng 2025 electrically heated hose catalog, p.10 paraffin (3D printer wax) hose and p.4 order form and model code, and our published business policies. Notes on wax setting in a cold section, heating the run end to end and sensor placement are general engineering practice.