Electrical interface fasteners

A three-dimensional (3D) additive manufacturing apparatus comprising:

• at least one material ejection device to eject material onto a print zone;
• and
• an electrical interface system to electrically couple the material ejection device to control circuitry of the 3D additive manufacturing apparatus, the electrical interface system comprising:
• a mechanical fastener, the mechanical fastener comprising:
• a first handle;
• a second handle, the first handle and second handle being located on opposite sides of the mechanical fastener and pivoting in opposite directions with respect to one another;
• a first housing;
• a second housing coupled to the first housing;
• a first electrical interface housed in the mechanical fastener between the first and second housings;
• a first lever between the first handle and the first housing and mechanically coupled to the second handle;
• a second lever between the second handle and the second housing and mechanically coupled to the first handle;
• a first post coupled to the first handle and the second lever;
• and
• a second post coupled to the second handle and the first lever;
• and
• a number of hooks formed in a housing of the material ejection device to which the mechanical fastener couples.

A camlock connector for an edge card electrical connector comprising:

• two handles located on opposite sides of the camlock connector and pivotable about parallel axes in opposite directions relative to one another;
• a housing;
• an electrical interface housed within the housing;
• and
• two cams coupled to each of the handles to transforming pivoting motion of the handles into movement of at least two posts coupled to the handles outward away from the housing and into an engaged position.