Pneumatic 5/3-way valve (manual)

There is an [improved version](https://www.thingiverse.com/thing:3200326) with connectors. The 5/3-way manual pneumatic valve can control one pneumatic cylinder with 4 mm tubes. Throtte control is possible and only two 3D printed parts are needed per valve. Four valves fit on one manifold frame as pictured, making use of the feed-through port of the air inlet. All my pneumatic stepper motor designs can be directly controlled using this manifold.