Author Topic: "Asteroid of Death" spaceship, by Frank R. Paul  (Read 6465 times)

Offline Old Wombat

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Re: "Asteroid of Death" spaceship, by Frank R. Paul
« Reply #15 on: May 30, 2016, 09:40:22 PM »
Not "stupider", mate, "empirically experimental". ;)
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Offline Frank3k

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Re: "Asteroid of Death" spaceship, by Frank R. Paul
« Reply #16 on: May 30, 2016, 10:01:57 PM »
Thanks for making that, Brian! It looks really good.  It looks like the nose probe didn't fully print, but that's easy to fix or ignore. The little rockets around the edge printed well. The fit will be very tight, since I used very little tolerance between the parts. You'll have to trim the ABS to get a tight fit

I can see some areas where I can improve/do a better job at matching the drawing, though.

Offline Frank3k

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Re: "Asteroid of Death" spaceship, by Frank R. Paul
« Reply #17 on: June 07, 2016, 12:34:16 PM »
I wasn't completely happy with my interpretation of the ship, so I went back to the drawing board - so to speak - and examined the artwork in greater detail. The spherical section really is a sphere - I traced the white fin and rotated it along the axis of the ship to match the curves along the windows.  They matched, so I'm going with a sphere. The drawing perspective is clearly for dramatic purposes and not a technical drawing (duh).

Here's the improved design. The main changes are the triangles and angles rockets near the engine end, the engine supports and the rocket ring/fin extends further towards the rear. The nose is a little longer. I may add 2001-style pod bay doors where the meteor damage is, before I have it reprinted:





« Last Edit: June 07, 2016, 12:36:53 PM by Frank3k »

Offline Antonio Sobral

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Re: "Asteroid of Death" spaceship, by Frank R. Paul
« Reply #18 on: June 08, 2016, 07:24:17 PM »
I am also green...but with envy :)

I suppose this will be eventually the future of modelling and nowadays is becoming standard practice,
but it still gives me the sense of something "magical".

Thanks for sharing!

Offline Frank3k

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Re: "Asteroid of Death" spaceship, by Frank R. Paul
« Reply #19 on: June 09, 2016, 10:36:24 AM »
I suppose this will be eventually the future of modelling and nowadays is becoming standard practice,
but it still gives me the sense of something "magical".

Thanks Antonio! I don't think 3D printing displacing scratchbuilding or kit basing any time soon. Not only is it expensive, most of the printers available to hobbyists still have printing artifacts that have to be removed. DLP printers are becoming affordable (and they produce acceptably smooth surfaces) but the resins are still very expensive.

I see it as both an education worth paying for and the cost of staying proficient with the software. If I get to build models in the process, all the better.

Offline Frank3k

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Re: "Asteroid of Death" spaceship, by Frank R. Paul
« Reply #20 on: June 13, 2016, 02:19:26 AM »
I got the first version print back from Shapeways, and the DLP printer is awesome! This is what I had always hoped Shapeways would produce.

It's hard to photograph the black plastic. There are some minor surface blemishes and printer artifacts, but they're tiny and should disappear with only a little effort:


The lower hull sphere is just held up against the rest of the ship. I need to work on my tolerances, because there are none. I'd rather sand a little until the parts fit tightly rather than use putty to fill in a gap:


This is the lower hull sphere end. This is probably where the support "sprues" were printed. Fixing these blemishes will be nothing compared to sanding out all the printer artifacts in the ultra and extreme detail acrylic:


Very few printer artifacts are visible. The raised pipe under the upper row of portholes is around 0.20mm in dia. The pipes around the lower portholes and below them are 0.5mm in dia:


The engine end has some rocket tubes missing, but I was at the limit of the printer or slightly below. Still a good result:


This acrylate material feels more like resin or styrene and doesn't feel as brittle as their ultra and extreme detail acrylic, which is very brittle and needs some extra UV (either from a lamp or indirect sunlight) to fully harden one you get the part. The acrylate material feels ready to go. Just some cleanup and it's ready for printing.

I don't know what DLP printer Shapeways is using, but the results are similar (or slightly better) to those of the Formlabs Form 1+ or Form2.

I'll have to make some minor changes to the current version of the ship before I send it in, but these results are very encouraging.

Offline Brian da Basher

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Re: "Asteroid of Death" spaceship, by Frank R. Paul
« Reply #21 on: June 13, 2016, 04:31:56 AM »
Thanks for a great update, Frank! I've been watching with much interest. While this stuff is still a bit beyond me, I'm very much enjoying getting a window into it all.

Work of this precision is amazing to me. It seems this stuff has come a long way since it first became available.

Brian da Basher

Offline apophenia

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Re: "Asteroid of Death" spaceship, by Frank R. Paul
« Reply #22 on: June 13, 2016, 08:56:39 AM »
Amazing stuff! So, if I understand properly, the trick is to design in extra material for sand-to-fit finishing of parts?
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Offline Frank3k

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Re: "Asteroid of Death" spaceship, by Frank R. Paul
« Reply #23 on: June 13, 2016, 10:11:29 AM »
Thanks guys!

Quote
Amazing stuff! So, if I understand properly, the trick is to design in extra material for sand-to-fit finishing of parts?

The 3D printers aren't 100% exact, so if you want a press fit with minimum sanding (or you want movable parts), you need to add some clearance between the parts. It depends on the material, but for the acrylate, the clearance between parts should be 0.5mm or greater. I often just "cut" the part in the software so the clearance is zero, then sand/trim one or both to fit. I should add clearance, but on one model I made years ago, even cutting the clearance in half produce loose parts.

I've glued the ship and primed it in white. There was some warpage on the bottom hull sphere, but it was easy to deal with. I'll let the primer harden and start the masking.

Offline Frank3k

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Re: "Asteroid of Death" spaceship, by Frank R. Paul
« Reply #24 on: June 20, 2016, 10:04:36 AM »
Even though this isn't the final version, I decided to do a painting and masking test on this print, in preparation for the second version printing now. It will include a damaged lower hull.

I didn't worry too much about the paint seeping under the tape. I just noted the locations.

The white is a new acrylic primer by Badger. It has a ridiculous name - Stynylrez - but I was impressed with the coverage and durability of the primer (I used the white primer, since the resin is black). The other colors on the model are Vallejo reds and yellows, which are not "masking friendly" but they both stuck well to the Stynylrez (I guess it stands for "Styrene, Vinyl and Resin").

I did almost no surface prep, other than fill in some of the divots left by the printing support structure. There are some printing artifacts visible, but they're either hard to see or add visual interest to the surface (from some angles it looks like plating).









It came out OK. I tried filling in some of the windows with Tamiya smoke, but that would have been more effort than I wanted to put into this model.
Masking some of the curved sections was an issue and I may just generate a mask on the computer and cut it to fit. Since the fit is exact, I may print and mask the lower and upper hulls separately.


Thanks for looking!

Offline Weaver

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Re: "Asteroid of Death" spaceship, by Frank R. Paul
« Reply #25 on: June 20, 2016, 08:15:33 PM »
That looks great Frank - well done!
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Offline buzzbomb

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Re: "Asteroid of Death" spaceship, by Frank R. Paul
« Reply #26 on: June 21, 2016, 07:58:25 PM »
Frank that is just awesome...
The quality from Shapeways is superb, as I expected.
Nice job on the "demo" model a well.

Offline Dr. YoKai

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Re: "Asteroid of Death" spaceship, by Frank R. Paul
« Reply #27 on: June 21, 2016, 09:08:39 PM »
Dang, you're awesome. Looks beautiful.

Offline Frank3k

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Re: "Asteroid of Death" spaceship, by Frank R. Paul
« Reply #28 on: June 22, 2016, 11:25:52 PM »
Thanks guys! Masking took a very long, annoying time but it did come out better than I had expected.

The Shapeways DLP resin feels (and responds) a lot more like styrene than the output from their Frosted Detail acrylics - it certainly feels less brittle. The high definition acrylate is also cheaper, so for a slight reduction in resolution you get a cheaper part that's easier to work with and requires almost no surface prep.

Offline Camthalion

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Re: "Asteroid of Death" spaceship, by Frank R. Paul
« Reply #29 on: June 24, 2016, 05:39:20 AM »
Nice one