Rubik's 4x4x2 cross blocked

It's a improvement of my own 2x2x3 blocked cube. Mid four cubies are connected together.

I have printed in ABS, smoothed carefully with sandpaper, acetone vaporized.
Standard PLA should work.
Print 2x mid.stl and 16x corner.stl. Support material required. Assembly with M3 screw and selflocking nut.