I used to do lost-wax metal casting. My wife still does (using bronze).
A similar approach seems like it would lend itself to microfluidics.
Melt some sugar, and pull it into thin threads.
Build your device by bending and connecting these threads to form the chambers and tubes you wish to have in the final device.
Embed the sugar threads in a casting medium such as acrylic resin.
When the resin has hardened, boil the device in water, and flush hot water through the tubes and chambers until all the sugar has been removed.
The process can be made easier by soaking silk or dacron thread in the melted sugar and using that to form the main channel. As the sugar dissolves, you can then pull the thread through the device, speeding the removal of the sugar.
The thread can also serve as an alignment mechanism between two pre-manufactured blocks. Apply a vacuum to one end of a block, and insert the thread into the other end. The thread will be sucked through the device and come out the other end. feed that end into the second device, and apply suction to the other end of that. Now you have two devices connected by a thread that runs through both of them. The chamber with the thread will automatically align the two devices. Bond them together, then remove the thread.
On Sun, Mar 1, 2015 at 2:13 PM, Nathan McCorkle <nmz787@gmail.com> wrote:
On Mar 1, 2015 1:35 PM, "Bion Howard" <flesheatingemu@gmail.com> wrote:
>
> Are you talking about stereolithography?
>Most likely if you want fine features of <~25 microns. Photoresist is cheap though, exposing it is the trick needing a good solution.
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