Re: [DIYbio] open source syringe pump

On 09/23/2014 07:16 AM, Cathal Garvey wrote:
> The guys from Briefcase Biotec used linear actuators with simple 3D
> printed syringe/actuator holders. They'd probably be happy to share the
> designs/parts?

If not, just scanning ebay could turn up cheap parts to try out:

201174145982 Two Firgelli PQ-12 f 5Vdc Linear Actuator looks new untested

231327513259 Haydon Switch Stepper Motor Rotary Linear Actuator E43H6Q-3.6-001


What would really get the price down is if one could get results 3D printing
fine toothed gears. Not with a filament printer, but...it's coming.

Meanwhile find a stepper with small light form, add a gear on its shaft,
make a frame to hold one or two more gears, the syringe plunger and syringe,
and the syringe driver with rack for the gears to drive. Rack and pinion style
means the long part is the plastic syringe plunger holder with gear teeth.
The long part is not metal, so costs can be lower. Like 75 cents in proto qty.

http://www.aliexpress.com/item/0-5-Modulus-plastic-rack-and-pinion-lever-linkage-rod-Transmission-lever-linkage-rod/1739130800.html

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