Capricorn
Capricorn XS Premium PTFE tubing for 1.75mm filament
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Capricorn's flagship PTFE tubing, enhanced with a proprietary blend of high performance additives. 1.9mm inner, 4mm outer diamter for 1.75mm filaments.
This is, hands down, the single best PTFE Bowden tubing you can buy for your home 3D printer.
Guaranteed to always be the right diameter, and perfectly round. Print flexible filaments without the binding up that happens with over-diameter tubes.
Each meter of tubing comes with one Capricorn sticker to decorate your printer.
| Additives | Blue color and secret high lubricity additive mixture |
| Best for chunky filaments | Yes |
| Best for flexibles filaments | Yes |
| Can see through | No |
| Pulling friction♠ | 0.8 |
| Color | Dark blue |
| Density (kg/m3) | 2300 ± 100 |
| Hardness | 60–65 |
| Inner diameter (mm) | 1.90 ± 0.05 |
| Outer diameter | 3.95 ± 0.05 |
| Linear thermal expansion at 250˚C | 2.2–3.3% |
| Material | Highest quality pure virgin PTFE |
| Melting point (˚C) ♥ | up to 340 |
| Roundness (ε) | < 0.1 |
| Stiffness § | Medium high |
| Thermal conductivity (W/m-k) | 0.25 |
| Wear rate (gm/s) | 0.01 |
| Young's Modulus (GPa) ¥ | 0.53 |
♠ Pulling friction is calcualted as the average force required to pull 1.2 meters of 1.75mm PLA through 1 meter of tubing at a constant speed, relative to 1 meter of cheap white reference tubing. Note that although Capricorn observed the friction of the TL series to be about the same or even slightly lower than the XS series, it also has a large internal diameter.
♥ Temperatures were approximated by heating samples of all tubing simulatenously, obseving how quickly each one began to deform. Printer failures may happen at significantly lower temperatures.
§ Other Bowden tubes may vary significantly in stiffness, depending on the material from which they're made. Capricorn tubing generally tends to be more flexible tha most, with the TL being more flexible than XS.
¥ Young's Modulus (YM) is the measure of elasticity of the material. Capricorn's XS Series additives give the PTFE a slightly greater YM than the TL series.
