PTFE Teflon tubing 10ft - 3mm ID X 4mm OD for 1.75 Filament Bowden 3D Printer - Allen Tech PTFE Teflon Tube

Tubing works well in my A1 Mini 3D printer and AMS Lite. Plenty of it so I don't feel bad about wasting it if I cut it wrong. Seems to be holding up well for the last few months.

This is good to run between a spool (or filament dryer, like I did) and an extruder, as it's very loose and won't add appreciable drag while your extruder is pulling the filament. Because it's less draggy, it's better for this purpose than what you'd place between an extruder and hot end. However, it's useless for a "regular" Bowden setup (between extruder and hot end.) The ID (inside diameter) is too wide, allowing the filament too much freedom to move around at random angles, effectively changing the amount of pressure according to where the nozzle is, and that's no good. I tried that and found that it lead to weird inconsistencies in finish, especially at the top layer. So, for a regular bowden setup, use something with a slightly narrower ID.

Some 1.75mm Filaments for 3D printing are NOT 1.75mm some are actually up o 2.1mm meaning your common 4mm OD / 2mm ID tube won't cut it. Glow in the dark, word, carbon fiber, etc. can be greatly varying diameters and the run of the mill PTFE tubing won't work. I bought this and works fine with one caveat; make sure the spring teeth in you hot end assembly is tight of the thin PTFE tubing that this is may pull loose.

The 3mm ID size has a label saying "1mm ID", so not sure if it was mispackaged. Would work fine though if size was appropriate.

I needed to replace the small PTFE tube in my Ender 3 KE upgraded hot end. This tube fit perfectly and dimensions matched the original. I only needed a small piece, but the extra will be nice to have on hand. Highly recommended!

I was having trouble with my Bambu P1S, poor first-layer adhesion. Finally tracked it down to too much resistance with the more expensive tubing I had installed. Swapped to this 3mmx4mm and the filament has far less resistance. Just what I was looking for. Yes, this can kink easier than the thicker tubing but that has not been an issue for me. Also, the thinner tubing makes it easier to see the filament in the tube. The packaging is large and thus the tubing is not wound tight, this causes less curve memory when you install it. Overall very happy with the quality and value.

The PTFE Teflon tubing with a 2mm ID and 4mm OD for 1.75mm filament proves to be an indispensable component for 3D printing enthusiasts. The 5-foot length provides ample material for various projects, ensuring a smooth and consistent flow of filament. The high-quality construction of this tubing, known for its non-stick properties, minimizes friction, preventing clogs and enhancing the overall reliability of your 3D printing setup. Whether you're a novice or an experienced maker, this PTFE tubing is a crucial accessory for achieving precise and uninterrupted filament extrusion.

My printer came with 2.5mm ID tubing. I was adding some more filament spools so needed more tubing. I ordered this 3mm ID tubing thinking that would give me less friction, but my filament really drags in this tubing. It's hard for me to pull regular 1.75mm filament through less than 4 feet of this. I'm surprised the printer can do it.

Works well low friction reverse Bowden tube.

Very thin but very low resistance for pulling filaments

As described, matches the listed specifications

Great quality, used to restore a 20+ year old espresso machine.

No problems, working well.