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3d printed QR

Discussion in 'DIY peripherals' started by ALMO, Apr 18, 2016.

  1. ALMO

    ALMO New Member

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    I know the previous thread was closed.

    Just wanted to mention I had my second failure !
    Turns out the ABS was still slightly honeycombed :(
    Am now going to the Buchfink Q1R system.

    [​IMG]

    [​IMG]
    ALMO, Apr 18, 2016
    #1
  2. cgodwin

    cgodwin Active Member

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    I have a 3D printer, laser cutter, CNC router, plus the usual garage tools. The 3D printer is fun, and sometimes the best way to make a part. But most of the time when I'm making a serious part, the 3D printer sits idle and I'm using something else in the shop. I just can't get the precision or strength from a 3D printed part that I often need.
    cgodwin, Apr 18, 2016
    #2
  3. shannonb1

    shannonb1 Well-Known Member

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    You didn't follow the instructions. You were to print this at 100% infill. This is a structural part and can not be less.
    • Agree Agree x 2
    shannonb1, Apr 18, 2016
    #3
  4. ALMO

    ALMO New Member

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    You can blame 3dhubs for that.

    The first piece that was broken, the guy redid for free and I was told it would be 100% infill. As mentioned, turns out it was still slightly honeycombed.
    ALMO, Apr 19, 2016
    #4
  5. Masilicondrio

    Masilicondrio New Member

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    Use epoxy resin for reinforce maybe?
    But need to change the 3D design a little... i used polyester resin with 3d parts with good results...
    Masilicondrio, Apr 19, 2016
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  6. cgodwin

    cgodwin Active Member

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    Every single time I've had a 3D printed part break, the break has occurred between layers. The weak spot is the adhesion between layers, where the new layer doesn't melt completely into the previous layer. From your pictures it looks like that is how your part broke also. 3D printed parts don't have equal strength in all directions, but have a distinct grain just like a piece of wood.

    One approach is to print the part with a different orientation. Your part was printed with the hole for the shaft oriented vertically, which is absolutely the easiest way to print this. But if the part was printed with the hole for the shaft horizontal with 2 of the start point facing upwards, that would change the weak point of the part. Instead of shearing off, it would tend to split so it would loosen on the shaft. But your 6 mounting bolts would hold it together. So trading one failure mode for another, but probably better in this application.
    • Informative Informative x 1
    cgodwin, Apr 19, 2016
    #6