replacing nozzles

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  • #11701
    bill.knighton
    Participant

    On some forums I’ve read people had no luck replacing nozzles – it pulled out the threads from the hot end. So I’ve ordered a .6mm complete hot end but I am curious if the nozzle could be safely removed before it is ever used. If so why not apply some high temperature anti-seize compound so it could be removed in the future?
    I anticipate using abrasive materials like carbon fiber fill and I have seen demonstrations where brass nozzles are worn quickly. At $72 per hot end it is too expensive to replace regularly.

    #11703
    fred_dot_u
    Participant

    I hope you are able to determine this to a successful end. I hesitate to use any filament beyond PLA and ABS for the same reason as you’ve stated. Purchasing and destroying an expensive hot end is not an option. I have been considering to purchase a completely different printer in order to use exotics, but I’m in no hurry and look forward to learning of your progress.

    #11707
    Phill
    Participant

    This is what 250g of Carbon Fibre does

    #11709
    Phill
    Participant

    But you can get the nozzle costs down to ~50p by using E3D’s and get great results

    #11711
    fred_dot_u
    Participant

    I’d love to see a comprehensive instructable or the equivalent step-by-step for adapting the E3D system to the Sigma. It would have to include cable connection considerations as well as any other parts involved. I’ve seen bits and pieces, here and there, but nothing along the lines of a turn-key adaptation.

    #11713
    bill.knighton
    Participant

    matterhackers has shipped so I’ll try in a few days unless I hear why not. Maybe there are thermal issues. Am curious if silver heat sink compound would transfer heat and act as an anti-seize?

    #11716
    vlad
    Participant

    It is clearly manufacturing issue and it’s a shame they didn’t solve it yet!
    They even sell nozzles but don’t recommend changing them!
    I can understand having this problem for first batches of hot-ends, but not for such a long time.
    If this aluminium alloy doesn’t work well, maybe using an insert will help or choosing stronger al. alloy, or as you guys suggested – anti-seize paste…

    #11718
    Phill
    Participant

    I’ve put all the latest stuff here
    http://www.thingiverse.com/thing:1711935

    #11720
    fred_dot_u
    Participant

    Phill, I see your Thingy says detailed instructions coming soon. Is that a “kickstarter-soon” or a different form of the use of the word? (grin)
    I’ve added a comment to the Thingy with links for a US source of connectors. Quite inexpensive. I should be able to buy the parts for a bit more than US$150, still less expensive than a new printer.

    #11722
    Phill
    Participant

    Thanks I’ll update the description with those links πŸ™‚
    I’ll honestly try to get some instructions done asap.
    I also use these on the E3D https://m.fasttech.com/products/0/10013091/2208807-brass-0-4mm-3mm-e3d-v6-extra-nozzle-for-3d so the running costs are really small.

    #11778
    bill.knighton
    Participant

    the .6mm hot end arrived. Unused, the nozzle came out. The thread was tight but there was no damage. It’s going back in with some permatex anti-seize.

    #11797
    fred_dot_u
    Participant

    Bill, that’s good news. Will you be making a similar attempt after you’ve run some filament through it, to determine future capability of low cost nozzle exchange?

    #11799
    bill.knighton
    Participant

    yes.

    #11801
    bill.knighton
    Participant

    Phill do you have good xy dimensional consistency?
    My squares, circles, any shape are 0.35 to 0.5 mm shorter on the y axis dimension

    #11803
    Phill
    Participant

    It seems pretty good. I’m currently printing some mounts for a set of geared bondtech extruders and they came out spot on. My Sigma is mutating weekly though :/
    Go for E3D if you can. It will solve all the jamming and clogging issues.

    #11805
    Phill
    Participant

    I will say though the esteps do seem a little out in the stock firmware. I spent a day tuning up so that may be why mine are exact. I’m using the original X,y steppers still.

    #11811
    bill.knighton
    Participant

    Should Esteps have an effect on the xy dimensions then? Like the blob of plastic on the tip of the extruder is in error instead of the xy steps/ mechanics?

    #11813
    bill.knighton
    Participant

    I just printed some gizmo dorks tpu through the new .6mm nozzle. I put silver heat sink compound on the top thread where the finned parts goes as recommended by bcn. On the nozzle I used anti-seize. The printing went well but I had to turn the flow up to 140-150%! I have cura set to .6 instead of .4. Maybe for some reason it still thinks it’s at .4 though and that’s why the 150%

    #11815
    bill.knighton
    Participant

    I probably will upgrade the printheads sometime.
    It might be a while since I’d like to get some mileage out of the existing nozzles. I’m really impressed by this machine and it will be worth any modifications it takes.
    The XY constancy is going to be right no matter what it takes.
    When you tuned the esteps did that require rebuilding the firmware source in the arduino ide or is there some configuration file?

    #11817
    Phill
    Participant

    I actually didn’t mean esteps. I altered the steps per unit for X and Y and then calculated the esteps again. It’s all in the firmware config file.

    #11895
    fade99x
    Participant

    I stripped my nozzle out removing it. So I put E3d blocks and nozzles on both heads. Had to redesign the fan housings though.

    #11898
    fred_dot_u
    Participant

    fade99x, do you mean that you modified Phill’s design or that you created your own fan housing design in order to fit the custom modification you performed?

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