Highly holds the bowden tube more than a standard connector. Suitable for 3D Printer but you must cut your bowden tube inside your hot end.
Fitting does not allow tube to pass through, and release does not work. Once tube is inserted, it is impossible to remove even when attempting to press the release with pliers. I have other metal fittings which have the same problem with the tube not passing through, but they were not advertised as bowden so that was okay. They also had a release that easily works by hand by pressing the ring. These fittings are useless for bowden unless you drill the hole bigger yourself, but even then the release does not work so once you insert the tube, you will have to put the whole tube through to get it out.