Parametric pneumatic manifold base

This pneumatic manifold base links valves, switches and/or pneumatic connectors together.
The standard diameter of objects is 22 mm, so the standard pattern spacing cannot be lower than that value. The maximum spacing is about 50 mm.

The manifold can be single-sided or double-sided. Unused ports can be shut off with blinders.

Compatible parts:

[Non-return valves and sockets](https://www.thingiverse.com/thing:3142024)
[Logic gates](https://www.thingiverse.com/thing:3186352)
[Manual valve v2](https://www.thingiverse.com/thing:3200326)