UPDATED: Polished USB port slots, and openings for keyboard and screen.  Added 7 screw points to secure the case together.
This is my raspberry pi 3 powered handheld computer.  I have played with 3d printed palmtop computer designs and wanted to try an open face design reminiscent of the old blackberry phone form-factor.

The HyperCube Evolution 3D Printer is a CoreXY printer inspired by the excellent HyperCube 3D Printer developed by Tech2C. The belt arrangement on that printer was the neatest CoreXY arrangement that I have seen.
I have leveraged the great work that Tech2C has done to refine his design and incorporated this with my own further development to reduce the number of printed parts and simplify the build.
Design goals for the HyperCube Evolution 3D Printer:

Increase the stiffness of the printer to further improve / reduce vibration artefacts.
3030 extrusion used for the frame
2020 extrusion used for the build platform frame
8mm diameter X rails
10mm diameter Y rails
12mm diameter Z rails

Minimise the size of the printer for the chosen build volume.
Parametric CAD design in Autodesk Inventor
Excel spreadsheet provided to allow for customised printer size

The prototype printer, with a build volume of 300 x 300 x 300, met with all expectation but did show some small bed vibrations when printing at high speed due to…