Modified the headphone stand for vertical printing without supports.

Also modified to better fit the build area of the Cetus3D Extended. Width reduced to 82% (feet spread), 3% boost to length and 15% boost to height.

NOTE: Latest version looks like it slices really nicely at .2mm layer height/200 micron. Will print at lower resolutions but might have some roughness on the bottom of the center bridge

Removing the Work in Progress tag but can address issues if they pop up.