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  1. #1
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    Cartridge Replacement Tube - The Machining Method

    I know there is another thread of this flavor. Just wanted to put this here for now.

    Cartridge replacement tube - the machining method.

    McMaster-Carr delivered a 5' length of crack resistant Telfon PFA Clear Tubing, p/n 5733K52 $11.90

    After a couple of test cuts, it turns out a bicycle spoke with a nipple helps hold the tube in the lathe.
    Also a few extensions to the head-stock to keep the remaining 20" of tubing under control.

    I started by cutting a 24" length of material.
    Begin with the nozzle end since this is where things can go sideways.
    I needed about 25mm cut down to 3mm OD for the nozzle clearance. Be sure your nozzles are clean! A 3mm drill bit does wonders for this.
    Then 6mm of "bulb" then 6mm of 3mm OD again.

    I didn't cut the extra 2" off so my tube is a little longer that the original 22"

    Next, I turned a small end down to 3mm OD, 6mm of bulb, and 4mm of 3MM OD.

    The hole in the nozzle housing is an oversized 4mm. I drilled it to 4mm and reamed it a little.
    The fit is snug. Be careful not to tweak the 3mm OD sections as you load this.

    For everything to be really nice, drill a 4+mm hole in the cartridge "knuckle"... the white piece trapped in the cartridge shell.
    I didn't have a spare, so I left it out for now.

    Word of WARNING!... remove the filament feeder from the cartridge housing before removing the filament spool.
    This one act put a lot of stress on the machined section. Just pull the two flathead screws and save yourself some trouble.

    Generally, this is a well strain relieved way to add 4mm tubing. I do what to find something a little better for size tolerance.
    The ID is well over 2mm, and the OD is well over 4mm.
    The closer we can get this to 2mm or even 1.8mm, the more control the machine has over the filament.

    Also, I have some older (non-windowed) cartridge case covers that I will cut down. This really helps with all kind of access.

    Some pics...
    Attached Images Attached Images

  2. #2
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    Like the way you did the tubing. I was working on the same but as usually other things come up to pull me to other projects lol.

  3. #3
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    Well just got done running a print as i type. will upload when print is finished. only toke about 45 minutes to install new tubing.

    Tried uploading pics but keeps failing.

  4. #4
    Administrator bolsoncerrado's Avatar
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    So any DIY tutorial on how to work the tubing to get this mod done ourselves?

  5. #5
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    Too many places to file information

    I decided this is not a good idea.
    The tubing has too much clearance to even do a good machining job.

    To fix a broken tube, the splice works...
    And modifying a stock tube actually works better.

  6. #6
    Administrator bolsoncerrado's Avatar
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    Now translate what you just said lol

  7. #7
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    It means I need to go back to the drawing board.
    But the tubing I purchased had too much clearance, which means that a retract function was not optimized.
    We need a tighter fitting tubing.
    I ordered some from China.
    Let's see how that works.

  8. Thanks bolsoncerrado thanked for this post
  9. #8
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    I will do full info on what i did because i have the other side to do. Wish i could upload pics but still not working.

  10. #9
    3D Printer God(dess)
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    True, I am not able to upload images from computer either.

    Looking forward to your solution.

  11. #10
    Administrator bolsoncerrado's Avatar
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    What error do you get trying to upload images, guys?

 

 

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