I've never seen a real gear pump design on Thingiverse, so I made one!
What you see is a heavy remix of this:
https://grabcad.com/library/gear-pump-19
Thanks for the amazing design, Javier.

Which has been adapted to be printable, minimalistic, fit usual parts like 688Z bearings (608 also can fit if the body is edited properly), M3 screws and pneumatic sockets with M5 thread held in place by a nut.

No

Yes

0.15

22%

Simplify3D used as slicer, for different programs the settings can be drastically different.

I suggest using Nylon for gears and washers and ABS for the other parts.