PTFE Teflon tubing 10ft - 3mm ID X 4mm OD - Allen Tech PTFE Teflon tube

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!

Good quality bowden tube. Using it to replace the QIDI Plus 4 tube which, to my surprise, was 3mm ID and not 2.5mm ID. This tube is the exact same dimensions as factory. Filament runs very smooth through it unlike some cheap tubes.

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.

Needed longer tubing for my ams lite so I can mount it on the header of my work bench and it's been working great. First roll came smashed so I ordered a replacement and this one had just a couple inches smashed so I just cut it away instead of dealing with returning it again. Don't know who's at fault but I'll try a different brand next time and also go back to grey like the original is. Grey just looks better imo.

I bought this to use as a reverse Bowden on my 3d printer and it works great. I chose the 4mm OD 3mm ID so there would be less restriction in the feed to the direct drive extruder. I haven't tested it with flexible filament like TPU but I imagine it won't give me any issues.

I use my printers primarily for business, so when they are down I’m losing money. The ID is a bit larger than the BL OEM tubes but these had next day delivery so I went with them. This tubing has worked without any issues. Good value for the money. Would buy again when needed.

I use PTFE tubing on my 3D printer, and when I needed a longer tube for mounting a group head pressure gauge to the outside of an espresso machine, I found this worked perfectly. Was a little concerned that the pressure fittings would not seal with the tubing properly, but using a PTFE cutting tool, the tubing worked with no leaks whatsoever.

Tubing is as advertised. Make sure to opt for Amazon packaging.I ordered two rolls. One was fine, the other was completely flattened rendering it useless.