|Sli3DR has excellent print results|
Here is a diagram of "unnamed" mechanical movement that is used on this machine with Spectra line which originates from old pen plotter machine:
You can find out more about this mechanism on RichRap's blog.
Update: one of the commentators claims it that the mechanism is similar to the movement of Stratasys Fortus machines. Since I'm not familiar with them I can not confirm it ... hopefully this mechanism will be identified and it's origins clarified ...
Richrap's blog and introduction source post:
You can get all the filees needed to make it on Youmagine:
... and GitHub including Repetier Firmware: