Syringe dosing unit

Almost completed design. Will be modified in future to solve notices below

14.11.2017 - were uploaded new models. Fixed some small issues
15.11.2017 - successful test with mine Arduino code. There are some future changes planned - syringe can be inserted from side, add sliding elements to middle part because printed one has some movement resistance, sometimes coupling is disconnected in way back- could be protected by small dowel (0.8mm) or purchased metal coupling from eBay
Good think is t