Gas station without pumps

2021 July 21

3D-printed “quantum dot”

Filed under: Uncategorized — gasstationwithoutpumps @ 10:40
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Earlier this year, I saw an article at https://scitechdaily.com/direct-visualization-of-quantumdots-reveals-shape-of-quantum-wave-function-of-the-trapped-electrons/ that included a very pretty picture of the scanning-tunnelling micrograph of the trapped electron.  I asked the author (Jairo Velasco Jr) for a copy of the data, so that I could 3D print it.  It took me a few attempts to get the scale and clipping right, but I was unable to get a good print using my Monoprice Delta Mini printer.

quantum3-gold

Here are two not-very-successful prints using silk-gold PLA filament. There was a lot of stringing and the peaks were too fragile and snapped off.

I finally got around to asking BELS to print one for me on their resin printer.  I had two choices of resin (clear or black), so I picked the opaque one.  The results are much better:

quantum3-black-top

Top view of the black resin-printed electron density.

quantum3-black

Somewhat more side view. I’ve played with the darkness here, to make the shape and layering more visible.

Unfortunately, they printed the part with supports, which rather spoiled the back, so I’ll probably order another one without supports.

quantum3-black-back

The back gives the scale: 32,000× in the horizontal direction and 2,000,000× in the vertical dimension. The ripples and dots are from the support structure, which was really not needed.

Correction 2021 July 28: The xy scale factor is incorrectly printed—it should be 320,000×, not 32,000×.  I had an error in my OpenSCAD code in copying the step size from the original data files.  The z-axis scaling is ok.

quantum3-supports

This is what the support structure looked like after I cut it away from the medallion.

The prints on the resin printer cost me an $11 setup fee, plus $3.64 for resin per print.  I think the tank is big enough to print 6 or 7 at a time, which would reduce the cost from $14.64 to about $5 each.  I’ll want to print a couple as gifts for the physicists who gave me the data. Each medallion is about 4.6 cm in diameter.

3 Comments »

  1. This is terrific! Thanks for posting the article.

    Comment by alanone1 — 2021 July 21 @ 10:48 | Reply

  2. […] 3D-printed “quantum dot”, I wrote about my attempts to 3D-print the image from […]

    Pingback by 3D-printed “quantum dot” revisited | Gas station without pumps — 2021 July 26 @ 14:55 | Reply

  3. […] 3D-printed “quantum dot” and 3D-printed “quantum dot” revisited, I wrote about my attempts to 3D-print the image from […]

    Pingback by Final 3D-printed “quantum dot” | Gas station without pumps — 2021 August 23 @ 14:44 | Reply


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