Another non-printed part less

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4 Responses

  1. aka47 says:

    Eric

    I had a new idea on terminating/securing the bowden tube inside the extruder head so as to use its sliperyness to ease the filament through the PEEK.

    There’s a piccy here :-

    http://forums.reprap.org/read.php?1,55188

    Don’t know if this is of any use to you ??

    • Erik says:

      You’re right that the PTFE (in PEEK) is very helpful there.

      I’ve got PTFE running down each of my extruders, but not the whole Bowden cable. This would make it way harder to do maintenance. It’s easy enough to glue in a slightly longer piece and use a cable to cable coupling, though.

      • aka47 says:

        Yeah I was trying to get away from glueing.

        I got the idea for flaring the end of the tube and clamping it between the Nozzle and Peek insulator, from fixing brake pipes on my landrover. I use a flaring tool to flare the copper pipe and it clamps up in a way thai is both fluid tight and mechanicaly robust.

        The other thing I have been considering is using a break cable outer over the bowden tube to limit the stretch and reduce ooze. Don;t know if this would work or not. It’s just an idea at the moment.

        • Erik says:

          You can limit stretch but you’d stilll have compression of the filament itself. Pressure management, open or closed loop seems better. Or use a brake cable for force transduction to close to the printhead. This may have to be non-continous.