MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
My first parallelogram frame actually did just that, without widening the top. It had a few disadvantages.
1) With a standard Prusa 1 or 2 X axis, build height was not improved, because the belts still run outside the frame, and still interfere at the top of the build height.
2) Having the Z screws be under compression instead of under tension may be a disadvantage when using more flexible (i.e. M5) Z
3) Moving the motors to the bottom requires the use of longer Z screws, which reduces the number of Prusa frame parts that can be reused.