Question 1

Will these PC4-M10 fittings work with my stock Ender 3 or Ender 3 V2 Bowden setup?**

Accepted Answer

Yes, absolutely. These are a drop-in replacement for the stock fittings on Ender 3 and Ender 3 V2. They use the standard M10 thread that screws directly into the aluminum extruder and hotend heat break. No adaptors or printed mods are needed for a stock setup.

Question 2

I have Capricorn PTFE tubing. Is 2.0mm internal diameter compatible with this coupler?**

Accepted Answer

100% compatible. The PC4-M10 is designed for 4mm OD PTFE tubing, which applies to both stock Bowden tubes and premium options like Capricorn (which only varies in inner diameter). The push-to-connect collet grips the exterior 4mm OD securely. Just make sure you cut the tube end clean and square before inserting.

Question 3

Do these couplings leak air or let the tube slip during long prints?**

Accepted Answer

In our testing and based on user feedback, these fittings maintain a tight seal and won’t slip under normal retraction pressure. To prevent any movement, we recommend using the included collet clips or zip ties on the collar. One tip from the community: push the tube in firmly and pull back on the collar after insertion to double-check the lock.

Question 4

Can I use these fittings on a direct drive toolhead, or are they only for Bowden setups?**

Accepted Answer

You can absolutely use them on a direct drive setup as long as your hotend has an M10 threaded throat. Many users install these to replace the heavy stock coupler with a lighter, low-profile fitting. Just verify that your direct drive heat sink has a female M10 port before ordering. If not, you'll need a PC4-M6 variant.

Question 5

I’m new to 3D printing. What exactly is included in the pack, and do I need to buy extra clips or washers?**

Accepted Answer

This pack includes 10 PC4-M10 fittings. You get the brass thread body and plastic release collar pre-assembled. We do not include PTFE tubes or collet clips — those are sold separately. However, for a standard Ender 3/V2, you can re-use your existing tube and clips from the original coupler. If you prefer fresh clips, a pack of 10 clips is cheap and will make the connection very rigid.

10PCS PC4-M10 PTFE Tube Connector Fittings, Bowden Coupler for 3D Printer | StLiSuYmx Premium Pneumatic Quick Male Straight Push for E3D-V6, Bowden Extruder Parts Compatible with Ender-3 and Ender-3 V2

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