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FUD still has major issues

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FUD still has major issues [message #43023] Sun, 29 January 2012 11:18 UTC Go to next message
avatar Col.Hajj  is currently offline Col.Hajj
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Registered: May 2011
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About a year ago I ordered a few 1/144 scale planes out of FUD to test the material and was not very happy with them. Since that time, a lot of uses of my website have been using WSF to print their planes and most of them are really happy with the finish quality (they know it will have a sandpaper type texture and are okay with this).

I'm personally not okay with a sandpaper finish to my planes, so I again gave FUD a try. Again, I was not very happy with the results. From what I've been able to research here on the SW Forums, it looks like my planes are suffering from both support material issues and print orientation.

If anyone can point out which issue is which on my prints, or whatever else might be causing them, I'd greatly appreciate it so that I can try and avoid them in the future.

Bristol Fighter.

Raw FUD:




Same model after I airbrushed white primer on it:




It appears that the plane was printed vertically with the nose as the base. This would explain the wide band running the length of the side (assuming it's from the support material that has to go under the tail). Same thing from the wide band on the under side, corresponding to the tail skid. What I don't get is why there is not a corresponding wide band on the top for the rudder.

You can also see pretty sever stepping as the fuselage narrows down towards the tail. It is hard to see it in these photos, but there is also a slight knitted or wavy pattern to the tops of the wings. You can see this better in the photos of the Fokker DR.I below.
Re: FUD still has major issues [message #43024 is a reply to message #43023 ] Sun, 29 January 2012 11:22 UTC Go to previous messageGo to next message
avatar Col.Hajj  is currently offline Col.Hajj
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Registered: May 2011
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Fokker DR.I

Raw FUD:






Same model airbrushed with white primer:




You can see the knitted pattern on the wings of this one much better. The stepping is still there around the fuselage, as well as the wide bands from what I think is the support material contact. There is also some odd artifacts on the top of the rear fuselage just before the tail. That was not there on another print of this same plane/file. I am not the designer of the 3D sculpt, but since I have direct communications with him, is there anything in the file that could be done to lessen some of these issues?

Re: FUD still has major issues [message #43039 is a reply to message #43024 ] Sun, 29 January 2012 15:37 UTC Go to previous messageGo to next message
avatar stonysmith  is currently offline stonysmith
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Registered: August 2008
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With the banding that is showing up here, it causes me to wonder.. is the tail section made up of long straight lines?

To be honest, this looks almost like a rounding error in the (Bresenham?) algorithm used when converting from STL to the "slices" needed by the printer.

Do you see this kind of banding across the (rounded) wheels or nose section?

It might well be that a more detailed mesh would reduce the use of the vector-to-raster algorithm and therefore have less of this problem. Hm.. I'm going to have to give that a try...

[Updated on: Sun, 29 January 2012 15:50 UTC]

Patience, Persistance, Politeness - the 3Ps will help us get us to Perfect Printed Products
Re: FUD still has major issues [message #43046 is a reply to message #43023 ] Sun, 29 January 2012 18:17 UTC Go to previous message
avatar Col.Hajj  is currently offline Col.Hajj
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Registered: May 2011
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By banding, do you mean the wide bands of raised area running the length of the plane?

If so, it stops just short of the tip of the nose on the Bristol Fighter as seen in this photo:


If you are talking about the vertical "steps" along the side close to the tail, it also stops towards the nose.

In both cases, the rounded part of the nose and wheels do not show these. The sides of the fuselage are flat on both models.

Here is another shot of the Fokker DR.I showing the odd or knitted texture to the wing surfaces.


In this shot, you can see it on the upper surface of the tail which should be virtually flat besides a couple of ribs that run front to back on the tail. You can also see it in the "valleys" on the wings, between the raised ribs. Those should all be smooth.


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