Sovol Capricorn PTFE Tubing 1M XS 1.75mm + 2X PC4-M6 & 2X PC4-M10 Fittings + Cutter for Ender 3 Review (2026)

A complete Bowden tube upgrade in one box

This kit bundles one meter of Capricorn XS-series PTFE tubing sized for 1.75mm filament with two PC4-M6 fittings, two PC4-M10 fittings, and a tube cutter, covering both ends of a typical Bowden setup on Ender-class printers. It suits owners of Ender 3, Ender 3 Pro, Ender 5, and CR-10 style printers looking to replace a worn or low-quality stock tube, since the listing specifically targets that printer family and includes the couplers those printers use rather than shipping tubing alone and leaving buyers to source connectors separately. Direct-drive printer owners without a long Bowden run will get less benefit from a full meter of tubing.

What Capricorn XS tubing and the fittings actually are

The XS-series tubing has a tighter, more precise inner diameter than typical PTFE tube, which is the main reason Capricorn tube is favored over generic tubing: a snugger fit around the filament reduces the amount of play that causes inconsistent retraction and stringing. Independent product specifications list an outer diameter of 4mm and inner diameter of 2mm, a working temperature range from minus 190 to 280 degrees Celsius, and resistance to common solvents, acids, and bases. The included PC4-M6 fitting has an M6 thread for the extruder side, while the PC4-M10 fitting has an M10 thread typically used at the hotend, both built around a 4mm tube outer diameter to match the tubing in this kit.

Installing and maintaining the tube

The included cutter is worth using rather than a utility knife, since a clean, square cut at both ends of the PTFE tube is what prevents small gaps that let filament ooze or bind at the coupler. Once the fittings are threaded in, the tube should sit flush against the nozzle at the hotend end, since even a small gap there is a common cause of clogs on Bowden printers regardless of tube quality. Because PTFE naturally degrades slightly with repeated high-temperature use, especially above 250 degrees Celsius on materials like ABS or PETG, it is reasonable to plan on replacing the section nearest the hotend every so often even with Capricorn-grade tubing.

Fitting compatibility and buying tips

The one real risk with any PTFE and fitting bundle is thread mismatch: not every extruder or hotend uses M6 and M10 threads, so it is worth checking your specific printer's stock coupler sizes before ordering, even though PC4-M6 and PC4-M10 cover the vast majority of Creality-style Ender and CR-10 printers. Buyers should also be aware that Capricorn tubing is widely counterfeited, and resellers vary in how verifiably genuine their stock is, so buying from a known, established listing rather than an unbranded one reduces the risk of getting lower-quality tube sold under the Capricorn name.

Verdict: a practical, complete tubing upgrade

For Ender-class and CR-10-class printer owners running a Bowden setup, this kit is a convenient way to upgrade the tube, both fittings, and get a proper cutter in a single order rather than sourcing each part separately. It is well matched to the printers it targets and should meaningfully tighten up retraction consistency versus a worn stock tube. Buyers with a direct-drive printer, or with hotend and extruder fittings outside the M6 and M10 standard, should double-check compatibility before ordering. Considering how inexpensive and quick the swap is relative to the printing problems a worn Bowden tube can cause, this kit is a reasonable piece of routine maintenance for any qualifying printer, not just a fix for an already failing tube.

Frequently asked questions