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Posted · Flexible nozzle/tip for Hornet trap

Who can help?
I try to make a flexible nozzel on a hornet trap.
The comon traps have a fixed opening and some of the bigger hornets are not getting in.
(diameter 10-8.3mm)
I have tried it with TPU93 on the standard setting, prints well untill you get to the finger highted and then it is rubbish
tried is with nylon, but then the fingers break.
Who has an idear?
image.thumb.png.84f59c903fabe12c3167a7d07b1ca05d.png
rubber top.stl

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    Posted · Flexible nozzle/tip for Hornet trap

    The STL comes in at a 1.6mm diameter for the base.  I don't think an ant could get in.

    This is the model on the bed of my printer (230 x 230).  That's a tough print.

    image.thumb.png.cfa58583f197f658264e08d9b324a325.png

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    Posted · Flexible nozzle/tip for Hornet trap

    What size are you trying to print it in? As @GregValiant the STL is importing pretty tiny. PP would have the flexibility you want but I'm not sure with those sorts of retractions is going to come out any cleaner than the TPU.

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    Posted · Flexible nozzle/tip for Hornet trap
    3 hours ago, GregValiant said:

    The STL comes in at a 1.6mm diameter for the base.  I don't think an ant could get in.

    This is the model on the bed of my printer (230 x 230).  That's a tough print.

    image.thumb.png.cfa58583f197f658264e08d9b324a325.png

    Outside diameter is 17mm and 20mm high

     

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    Posted · Flexible nozzle/tip for Hornet trap
    8 hours ago, limburgmetaal said:

    Outside diameter is 17mm and 20mm high

    The problem here is that STL files don't actually use real world measurements, just generic units. Convention is that 1 unit = 1mm, but your STL is a tenth of that so needs to be scaled up to 1000% to be the correct size.

     

    Even at the correct size, this is an incredibly tough print regardless of material. Those fingers are only 0.55mm wide at their narrowest point. And it's doing twelve hundred tons of travels between them as it prints. Okay, that's a slight exaggeration. But the actual number is 610. Even if you have a direct drive extruder, you will grind your filament into dust with all those retracted travel moves. But then you have the problem of if you disable retractions, does it get so stringy that it's impossible to remove the strings? 🤔

     

    As for filament: I'm not nearly as well versed as some of the others around here. I am the local TPU nutjob, but I tend to use 95A. And it's stringy as hell regardless of if you retract or not. Strings or not, I'm not sure it'd work well for this just because there's so little contact area between the bottom of each finger and TPU coming apart in a situation like that isn't very hard.

     

    How flexible does it need to be? PETG prints reasonably easily (slightly stringy, nowhere near as bad as TPU) and you will get a little bit of bend before it just snaps.

     

    I'm with @fbrc8-erin: anything particularly flexible is just not going to print well enough in this scale (even once you scale it up correctly). Just make sure that whatever you're printing with, that it's bone dry before you try to print with it. That'll slightly increase your chances of success.

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    Posted · Flexible nozzle/tip for Hornet trap

    That's going to be a lot more likely to successfully print. Just bear in mind three things:

    1. Your filament will need to be bone dry.
    2. Take it sloooow. Not sure about other flexible filaments but TPU prints best slow (I print it at 20mm/s)
    3. Even if you have the best retraction settings dialled in, it's still going to be string city.
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