MaybeCube EVA adaptors

These are EVA adaptors for the MaybeCube

[MaybeCube](https://www.thingiverse.com/thing:4912095) supports the [EVA modular printhead system](https://main.eva-3d.page). This allows a wide variety of hotends and extruders to be used.

The photo shows an EVA printhead with adaptors for the Bondtech BMG extruder.

In the pictures the adaptors are shown in blue, standard EVA parts are shown in green and black, and MaybeCube parts are shown in red or orange.

Since the belt spacing used by the EVA system is different to that used by the MaybeCube, adaptors are required: an adaptor for the EVA top part and an adaptor for the EVA bottom part.

The bottom adaptor is **EVA\_MC\_bottom\_mgn12\_short\_duct.stl**.

The top adaptor varies according to the extruder used - the part name is the same as the EVA part, but prefixed by **EVA\_MC\_**. So for example if you wanted to used the BMG extruder then you should use part **EVA\_MC\_bmg\_mgn12.stl** (rather than part **bmg\_mgn12.stl** t