Cutaway Rocket Single Perimeter for Seamless Spiral Printing

by mechg, published

Cutaway Rocket Single Perimeter for Seamless Spiral Printing by mechg May 26, 2016
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Based on my Single-Perimeter Rocket for Seamless Spiral Printing http://www.thingiverse.com/thing:458903
This cutaway shows the major components internal to the German V2 rocket from WWII.
The model is about 5.75 inches long when printed at 100% scaling.

Print Settings

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.2mm layers




Solutech Silver PLA, 225C filament, 60C bed, 25mm/s Spiral Vase mode sliced in Slic3r. Position on bed is X=90, Y=0, Z=-61, One perimeter. Fuselage shell is 1.2mm thick at 100% scaling, so extrusion width must be .6mm or less. It's best to have layer fan on 100% through entire print. The last 6mm of the very tip will likely be wobbly due to heat buildup, depending on the material. Reducing temp and speed during that portion of the print may help, otherwise be prepared to clean it up with your x-acto knife. If after slicing, you see glitches (missing layers) in the rendering, try rotating the model by 1 degree around the Z axis until it slices cleanly. Minus 61 degrees worked for me. Slic3r's spiral algorithm is sometimes sensitive to the starting point. If you can't eliminate the glitch, try printing it anyway - often the layer above will fill in the gap and you will just see a faint line because those two layers are narrower.

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Is this where Kim Jong Un gets his designs from?

great model! tried printing and I got this though. Any ideas? http://i.imgur.com/b9IFh24.jpg
Also, there seem to be a seam at the top of the warhead.

thats exactly how mine turned out too...

What is your material, temperature, extrusion width, and layer height?

PLA, 210, 0.4mm, 0.2mm,

If your printer nozzle is large enough to handle it, you might try setting a .5 or .6mm extrusion width. Those are the values I use with my .5mm nozzle. I don't know what other people call this issue, but I call it "interior overhang" . With .4 extrusion and .2 layer height, there is not much contact between layers at a 45-degree overhang. It is not an issue with an exterior (outside the cylinder) overhang because, as the printer head goes around, it pulls the material back toward the previous layer. But with an interior overhang on a hollow object, the printer head is pulling the material away from the previous layer, and there is no infill underneath to catch it. This means it needs more x-y overlap, hence the need for a wider extrusion width. Or, you could set a smaller layer height, like .1mm, but that will, of course, double the print time.

That makes sense! thanks a bunch. This might seem like a silly question, but you can't achieve a.5mm extrusion width with a.4mm nozzle right?

I regularly do .6 with my .5 nozzle. I think there are limits to how much larger you can go, though. Here is a quote from the Simplify3D forum at https://forum.simplify3d.com/viewtopic.php?f=8&t=2232

" For best print results, it is often recommended that your extrusion width be at least 1.2 times your nozzle width. This sets the width of the plastic printed for your model to be 0.48 mm for a 0.40 mm nozzle, sets it at 0.60 mm for a 0.50 mm nozzle, at 1.20 mm for a 1.00 mm nozzle, etc" ( I do not use Simplify3D myself, I use Slic3r and Cura)

Thats's great. Thanks for all the help!

Turned out really well, thanks!

wow a truly amazing design i like the combo between a really cool model and the speed of vase mode :)

I could be wrong but isn't the fuel tank the smaller one as you want 2 times more oxidizer then liquid fuel

You may be right. Most diagrams I could find doing a search on " V2 diagram" show the two tanks to be roughly equal in size, but I was not being all that careful to make all the parts accurate. If I revisit the design at some point I may adjust the proportions. For that matter, there are many other details where the model deviates from an actual V2 design. It was meant more as a demonstration of what one can do with spiral-vase mode than a historically accurate model.

The size of the oxidizer tank depends on the fuel being used. You generally want more oxidizer than fuel, but it also depends on how much thrust you need for a rocket. The A-4 (later named V-2 by the Luftwaffe) ran on high purity ethanol and does not need as much LOX as a rocket like the Saturn V (that used a refined form of Kerosene called RP-1 for the first stage).

One of the coolest designs I've seen in awhile. I've never done a spiral print before, but thinking I'll have to give it a shot for this one.