説明
Every 3D printer eventually fails at the same place. Not the nozzle, not the bed, but the joint where one length of PTFE tubing meets the next. The tube shifts half a millimetre under retraction, a gap opens, molten filament finds it, and a nineteen-hour print becomes a bird's nest at hour fourteen.
These connectors solve that with a machined through-bore rather than a push-fit coupler. Internal diameter 1.8 millimetres, outer 2.6 millimetres, 37 millimetres long: that is the dimension set of standard 1.75 millimetre filament tubing, sized so the bore continues uninterrupted across the joint instead of stepping at it. The tube seats flush at both ends and the filament passes through without catching on a lip.
They are consumables, and anyone who has run a printer for a year knows why. Tubing deforms at the hot end, couplers lose grip, and the spares drawer is always empty when it matters. Buying twenty or a hundred at a time is not hoarding; it is the difference between a twenty-minute fix and a week waiting for a delivery while the printer sits idle.
Most print failures are not calibration. They are a joint nobody looked at.
Why It Earns Its Place
- ✦ Through-bore design keeps the filament path continuous across the joint
- ✦ 1.8 mm ID and 2.6 mm OD matched to standard 1.75 mm PTFE tubing
- ✦ 37 mm length gives enough engagement to resist retraction creep
- ✦ Seats flush at both ends, so no lip catches the filament
- ✦ Suits direct-drive and Bowden extruder layouts
- ✦ Available in 20, 100 and 200 piece packs
- ✦ Consumable priced for keeping spares on the shelf
Technical Specifications
- Material PTFE tubing connector
- Inner Diameter 1.8 mm
- Outer Diameter 2.6 mm
- Length 37 mm
- Filament Size 1.75 mm
- Pack Sizes 20 pcs, 100 pcs, 200 pcs
- Compatibility Bowden and direct-drive extruders
- Function Joint PTFE tube runs without a bore step
- Brand 3DSWAY
- Origin Mainland China
Where It Belongs
For anyone running a Bowden-tube printer, converting a machine to a new hot end, or maintaining a small print farm where downtime costs more than parts. It is also the correct part for repairing a tube run that has been cut short during a nozzle change, which is the most common reason a printer starts under-extruding for no apparent reason. A print farm keeping a hundred on the shelf will use them within a year; a hobbyist buying twenty covers every tube joint on two machines plus replacements.
Questions Buyers Ask
Q: Will these fit my printer?
A: They suit any printer using standard 1.75 mm filament and 2.6 mm outer diameter PTFE tubing, which covers the majority of Bowden setups. Check the outer diameter of your existing tube before ordering.
Q: Do I need to cut the tubing square?
A: Yes. A square cut is what lets the tube seat flush against the connector bore. Use a tube cutter rather than scissors, which crush the end.
Q: Can I use them on a direct-drive extruder?
A: Yes, where the tube run is jointed. Direct-drive machines usually have a shorter tube, so fewer connectors are needed.
Q: How tight should the fit be?
A: The tube should push in with firm hand pressure and hold without a clip. If it slides in easily, the tube end is undersized or worn and should be re-cut.
Q: Will they withstand hot-end temperatures?
A: They sit in the cold end of the tube run, not in the heater block. PTFE near the hot end is a separate component and should be replaced at the same time if it has deformed.
Q: Are these reusable?
A: Generally no. The grip deforms once the tube is seated hard. Treat them as consumables, which is why the larger packs exist.
Q: Do they include the tubing?
A: No. This listing is the connectors only. Tubing is ordered separately in the length your machine requires.
Q: What causes a tube joint to fail in the first place?
A: Retraction creep. Every retraction pulls the tube a few microns against its grip, and after tens of thousands of moves the end has shifted far enough to open a gap. A machined through-bore resists that movement better than a push-fit coupler.
Q: How do I know when to replace one?
A: Under-extrusion that appears mid-print, a clicking extruder, or a visible gap at the coupler. Inspect the joint before recalibrating anything else, because the cheap part is usually the cause.
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