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Author Topic: Is it me?  (Read 185 times)

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Offline Bad Raven

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Is it me?
« on: November 24, 2018, 08:33:28 PM »
I think it must be, but that does not help resolve the issue I have now bumped up against a couple of times.

Most recently I fancied building a 3D printed plane, and yes I know it will be stupid hours run and likely fall apart, but hey, a man's got to do, etc.

And I have again tripped over the same matter as with some other files.

The plane (as an example) is this one:-

I have asked the owner of the model and await a reply, but the issue I have (and with other models) is that the designer does not give detail on infill settings.  This one is stated as most parts 0,25 layer high, canopy 0,1mm.  But no mention of infill other than for one part at 50%. If all of it was 50% it would too heavy to lift off!

Someone has said that they failed to print OK as the slicing failed to give the right pattern infill, and the designer thinks it is a Slic3r issue. No further detail on exactly what though.

I have downloaded the latest Cura but both it and Slic3r default to 20% infill, so its not specifically a Slic3r issue.

So, here we get to my meagre knowledge limit.................

1. How can you tell what infill % or pattern to set if you are not told, is it buried to see in the .stl somewhere?

2. If the guy uses Cura, and states use 0,25 layer height, which I assume is 0.25mm, why does Cura step from 0.2 to 0.3, as does Slic3r, with no 0.25 to choose?

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Offline Gaza07

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Re: Is it me?
« Reply #1 on: November 24, 2018, 09:34:00 PM »
I printed this one I never got round to finishing it though  :rolleyes:
I dropped it and broke a wing off its all held together with super glue and, I'm not sure it would be strong enough to fly, at some point I will prob finish it and give it a go  ::)

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Offline Bad Raven

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Re: Is it me?
« Reply #2 on: November 25, 2018, 06:38:04 AM »
The guy has come back quickly bless 'im, but only part answered. He says he uses Simplify3D.

Great, $150, I think not!

He says all except Fus 1 and motor mount are hollow no infill (logical, I'd got that!), but the rest have only one perimeter. Can't see how that would possibly be strong enough for a wing, and his distant photos of a finished transparent material model show what looks like diagonal infill at a very big spacing/low percent, countering what he's saying.  (Poss language barrier).

He says that those that do have infill are 50%. Fus1 is quite a robust box and I'm doubtful that 50% would add usable strength over say 20%, just weight? The actual motor mount I'd have thought better as 100%?

My choice of model is not accidental, it's a float around "scale" so won't suffer 3D stress (or maybe it will if it goes OK.........  :evil )
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Offline shawdreamer

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Re: Is it me?
« Reply #3 on: November 25, 2018, 10:00:04 AM »
personally, after long hours of designing, testing and re-designing (repeat several dozen times :cry), I doubt there's a 3d printed wing design out their that can stand-up to heavy stress maneuvers for anything like a extended amount of time and even less that can stand-up to a less than gentle landing.

on the brief moments of madness when I swing back to contemplating actually printing the wing design I made a while back I usually come to a logical conclusion, Id have to do something to it post printing to increase its durability, now if I do it in ABS (which I likely would) there's the acetone vaping route which granted works well but would mean chopping the model into vape managable chunks thus adding more weak points were the joins would be....kinda defeats the objective of vaping it in the first place :rolleyes:

the only other option I could think of was a "skin" of some sort, something like the ultra thin laminate sheet skins already used on balsa RC planes and wings, with a bit of careful time taken that stuff can be heat gunned into a even smooth skin across the whole frame and add some if not a great deal of overall strength to the frame :hmm:

Still think it'd just explode on the first bad landing though ::)
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