Mini 3D printer

Just got myself an Ender 3, so while it ships, I'm learning CAD and I designed this, a mini Ender 3 inspired 3D printer. It's not scaled, but it is supposed to fit in one's hand. Rails are supposed to be functionnal, so the bed, the y axis and the extruder assembly are supposed to slide.
It's mainly just a toy/prop thingy!

I guess it shall remain pretty smal, max. 10cmx10cmx10cm approx, otherwise printing gets awkward, especially for the frame components.