Syringe pump

I was looking for an syringe pump to automate the fertilization of my nano cube. My first try with http://www.thingiverse.com/thing:539490 failed. The mechanical part was not sufficiently stable. There are many syringe pumps projects at thingiverse but I decided to use the thing http://www.thingiverse.com/thing:536373.
Cause my printer has only a 80x80mm print bed this thing was perfect becauseall parts fits on my print bed.

But I've did some modifications so make the syringe pump works fine