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The 25.4m Giant Magellan Telescope (GMT) will be amongst the first in a newseries of segmented extremely large telescopes (ELTs). The 25.4 m pupil issegmented into seven 8.4 m circular segments in a flower petal pattern. At theUniversity of Arizona we have developed a novel pupil slicer that will be usedfor ELT extreme adaptive optics (ExAO) on the up and coming ExAO instrument,GMagAO-X. This comes in the form of a six-sided reflective pyramid with a holethrough the center known as a "hexpyramid". By passing the GMT pupil onto thisreflective optic, the six outer petals will be sent outward in six differentdirections while the central segment passes through the center. Each segmentwill travel to its own polarization independent flat fold mirror mounted on apiezoelectric piston/tip/tilt controller then onto its own commercial 3,000actuator deformable mirror (DM) that will be employed for extreme wavefrontcontrol. This scheme of seven DMs working in parallel to produce a 21,000actuator DM is a new ExAO architecture that we named a "parallel DM," in whichthe hexpyramid is a key optical component. This significantly surpasses anycurrent or near future actuator count for any monolithic DM architecture. Theoptical system is designed for high-quality wavefront (lambda/10 surface PV)with no polarization errors and no vignetting. The design and fabrication ofthe invar mechanical mounting structure for this complex optical system isdescribed in this paper.

A Novel Hexpyramid Pupil Slicer for an ExAO Parallel DM for the Giant Magellan Telescope