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  1. #31
    Super Moderator curious aardvark's Avatar
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    https://www.thingiverse.com/thing:4246413

    Dead simple - 100% effective.
    Simple belt tensioners. Or rather something that makes tensioning the belts really easy :-)
    They are currently being printed.

  2. #32
    Super Moderator curious aardvark's Avatar
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    The belt tensioners needed a little adjustment.

    I put -0.1mm on the internal surfaces of the 'screw/belt holder' part. As it was almost impossible to get belt into it otherwise. I also made the outer collar part 3% larger, otherwise it was too tight a fit.

    That done, they look good and should work well.

    Today, however, while i wait for a second motherboard for a super computer I'm building for a client to play flight sim 2020 on - I am playing with polycarbonate.

    Currently running at 260c and 70 for the bed.
    Given how different my pet-g bed temps are (60c) to the universally accepted temp, I thought I'd start low this time :-)

    So just printing a simple small flat scraper - as I have a pet-g one for comparision.
    It's 2mm thick , tests nothing apart from bed adhesion and printing temp.
    Also only running at 50mm/s - mainly because 260c is on the cool side for polycarbonate and there's no point pushing it for the first print :-)

  3. #33
    Super Moderator curious aardvark's Avatar
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    Results sa far: pc sticks well to pei at 90c with a small amount of 'smush'.
    Any hotend temp over 260c and it struggles.
    Fortunately that does seem sufficient to print pc.

    I have reduced fan speed to 0%
    Curious to see how that will effect stringing when I do a multi part test.

    But at the moment it does look like I can print polycarbonate :-)

    Okay I'll qualify that. I can make scrapers and pretty decent spudgers. And they are really strong and tough. Noticeably stronger than the pet-g.
    But complicated prints are going to struggle.
    Realistically you need to be able to reliable print at 270c and above.
    And that is not happening with the stock hotend.
    Bless her she tried - but anything over 260 just wasn't stable.

    But an interesting experiment and I can at least print some things from polycarbonate.
    Last edited by curious aardvark; 09-28-2020 at 03:35 PM.

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