Syringe Pump

I needed a syringe pump design for an open source laboratory autosampler project I'm working on. There were several good designs here on Thingiverse, but most only included STL files. Since I needed to customize the design for my needs, I used Openscad to create this design from scratch.

I wanted to be able to use a wide variety of brands and sizes of disposable syringes for use in transferring water samples from EPA Method 524 style 42mL glass septum topped vials.
Ended up using two syringes, both from McMaster Carr:

https://www.mcmaster.com/7510A655
30mL polypropylene syringe
https://www.mcmaster.com/7510a653
10mL polypropylene syringe

and to hook up the syringe to the sampler:
https://www.mcmaster.com/75165a244
1.5" Blunt tip dispensing luer lok 17ga. (nominal 1/16") needle

The 30mL syringe is for extracting samples from the vial, and the 10mL is for adding calibration solution to the sample for quantitation by Gas Chromatography/Mass Spectrometry.

The bigger