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Capricorn XS Tubing

Capricorn's flagship PTFE Tubing, enhanced with a proprietary blend of high performance additives.
  • 1.9mm inner, 4mm outer diameter for 1.75mm filaments.
  • 3.2mm inner, 6.35mm outer diameter for 2.85mm filaments.
This is, hands down, the single best PTFE Bowden tubing you can buy for your 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 order of tubing comes with a Capricorn sticker to decorate your printer.

Sold in increments of 1 Meter lengths (tubing will be cut to match the total quantity of tubing ordered). Don't forget to grab some fittings as well!

See below for lengths needed to upgrade Modix Large-Format 3D printers (learn more about Modix printers HERE). Note: for machines with 2 print heads remember to get twice the suggested amount of tubing!
Big-40: 2 Meters
Big-60: 2 Meters
Big-120X: 3 Meters
Big-120Z: 3 Meters
Big-180X: 3 Meters
Big-Meter: 3 Meters


Premium XS Series Dark Blue Tubing
Additives Blue Color and Secret High Lubricity Additive Mixture
Best For Chunky Filaments YES
Best For Flexible 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 or 3.20 +/- 0.05
Linear Thermal Expansion at 250 °C 2.2-3.3%
Material Highest Quality Pure Virgin PTFE
Melting Point (°C) up to 340
Outer Diameter 3.95 or 6.35 +/- 0.05
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 calculated as the average force required to pull 1.2 meters of 1.75mm PLA filament through 1 meter of tubing at a constant speed, relative to 1 meter of cheap white reference tubing. Note that although we observed the friction of the TL series to be about the same or even slightly lower than our XS series, it also has a larger internal diameter.
§Other Bowden tubes may vary significantly in stiffness, depending on the material from which they're made. Our tubing generally tends to be more flexible than most, with the TL being more flexible than XS.
¥Young's Modulus (YM) is the measure of elasticity of the material. Our XS Series additives give the PTFE a slightly greater YM than the TL Series.
Temperatures were approximated by heating samples of all tubing simultaneously, observing how quickly each one began to deform. Printer failures may happen at significantly lower temperatures.
Printing high temperature materials may create dangerous off-gassing. Please refer to the Safety Page.

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Category: Capricorn, Upgrade

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