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Earrings - Twisted Arcs
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December 06, 2019, 10:36:12 PM
Part of my girlfriend's Christmas gift is this new set of earrings.  The lower piece of this interlocking design had to be raised for the printing process, which also shows how they mate.

I started them by placing two symmetrical Arcs, slightly separated, and did a Rail Sweep of a Rectangle with filleted corners with ±180° Twist (complementary, so they'd be symmetrical, too).

The strut at the bottom of the upper piece was started by Extract Entity/ Extract face on the inside facet at the top of the lower piece, then filling it out and Extruding it to the sides.

(Rail) Sweep with Twist eats up a lot of space and processor time.  I used ACIS / Expert Faceter Parameters, but my initial setting (0.01mm and 2°) resulted in a 180 MB STL file and hundreds of thousands of duplicate facets.  MeshLab did a poor job of reduction; TurboCAD did better, but not good enough, so I changed the Faceter settings to 0.05mm and 5° which resulted in a 38 MB file (Shapeways has a limit of 50 or 60 MB, as I recall) that is smooth enough.  Still a lot of duplicate faces, so it went through MeshLab, too.  This fixed the irregular rectangular blotches you see in the image.  IMSI should either improve their STL export function or add more than Fix holes to the options.

One unexpected thing was that I couldn't specify Polished Brass for this go-around at Shapeways and had to accept gold plating (that's going to wear, unfortunately).  Another thing was that a lot of other people are doing the same thing this close to Christmas and I had to pay extra for expedited printing and overnight delivery to get them here before Christmas.


Jeff

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TC Pro Platinum 2019, 2018, 2017, 2016 & 2015 (all with LightWorks & RedSDK) & V21
System: i7-5820K @ 3.30GHz, ASRock X99 Extreme4, 16GB DDR4-2133 RAM, Gigabyte GTX 970, Samsung NVMe SSD 950 (256GB), Windows 7 Pro (64-bit) SP1


* December 07, 2019, 12:34:58 AM
#1
Clever design Jeff and I love the symmetrical shapes, just wondering why there appears to be a some small lighter coloured bands around them?

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Daz
TCW V21, 2015-2019 PP, Animation Lab V5.2 & Redsdk enabled, LightWorks rendering mostly.


December 07, 2019, 12:58:21 AM
#2
Clever design Jeff and I love the symmetrical shapes, just wondering why there appears to be a some small lighter coloured bands around them?

As I tried to explain, it is a flaw in the ACIS solid modeler.  I tried a higher resolution setting, but the resulting STL file was too large (it also took longer to render).  A lower resolution got a decently-sized file, but there were irregularities (270K duplicate facets and 20 non-manifold edges).  MeshLab fixed the problems in short order, as can be seen in the screen capture.


Jeff

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TC Pro Platinum 2019, 2018, 2017, 2016 & 2015 (all with LightWorks & RedSDK) & V21
System: i7-5820K @ 3.30GHz, ASRock X99 Extreme4, 16GB DDR4-2133 RAM, Gigabyte GTX 970, Samsung NVMe SSD 950 (256GB), Windows 7 Pro (64-bit) SP1


* December 07, 2019, 01:02:50 PM
#3
Nicely done, Jeff.

Henry H

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December 07, 2019, 01:38:14 PM
#4
Nice job Jeff. Every time you post ear rings I think I should make some for my wife. You are doing a good job inspiring others.


December 09, 2019, 10:22:33 AM
#5
Thanks, Darryl, Henry and Don.


Jeff

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TC Pro Platinum 2019, 2018, 2017, 2016 & 2015 (all with LightWorks & RedSDK) & V21
System: i7-5820K @ 3.30GHz, ASRock X99 Extreme4, 16GB DDR4-2133 RAM, Gigabyte GTX 970, Samsung NVMe SSD 950 (256GB), Windows 7 Pro (64-bit) SP1