Re: [DIYbio] Paper request

On Sat, Dec 27, 2014 at 3:09 AM, <scocioba@gmail.com> wrote:
> Tom's link worked perfectly. Thanks for the effort Dakota! Gonna see how
> small of a feature I can shrinky dink. I was planning some circuit like this
> last year but never got around to it. Worried the 20um posts will be too
> difficult to print and shrink properly. Even at the shrink rate of 63%
> (cited in shrinkydink microfluidics paper) I'd still need around 40um
> initial features so well see. Worst case maybe a series of smaller and
> smaller pillars. I'll post files once I get comfy with draftsight and thing
> actually works.
>

I just bought this yesterday for exposing photoresist, to use for
imprinting silicone, or maybe for use as a lithography photomask.
http://www.ebay.com/itm/Mini-Laser-200-250mW-Engraving-Machine-DIY-Carving-Logo-Picture-Marking-Printer/261591526091

The ebay listing says it is accurate to 10 microns, but I doubt the
laser spot will even be that small. Also I am not sure if that number
is realistic or just made up... but the stepper controller does have
microstepping so I have hope. I have a few ideas for upgrading the
laser, basically just adding a tube to hold the laser unit from a
blu-ray drive (because the optics in that have tons and tons of
engineering behind them to make them near perfect), or adding better
lenses and a pinhole in an optical tube.

Also it uses open-source hardware which is pretty cool, and I think
this is the relevant line of code to set the resolution of the
software:
https://github.com/grbl/grbl/blob/615093ccd2a9bd63f1ecd29c464f032000f5e626/defaults.h#L50

I recently made this in implicitCAD, I haven't made anything else
yet... but I will give your fluidic a shot!
https://github.com/nmz787/microfluidic-cad/blob/master/implicitCAD/output/sinusoidal_mixer.png

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