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.
Thank You for kind words.
If by re-calibration you mean uploading new firmware with changed values of steps per milimeter, than the answer is no. There was no need for it as cubic shapes comes out quite well and with reasonably low deviation. Problem with round shapes is probably in backslash of internal gearbox, although it was not proved to be true yet. Somebody also advised me to use Repetier with backslash compensation, but I do not have time for it either. Last thing I've printed on ToyREP was probably Marvin. Since than I made only few upgrades for ToyREP while working hard on second version, that will be mostly printed and with lesser amount of vitamins.
There is not much that can be done on your end, unless You will print one and by using it help me with development. The quality of prints is good enough considering the price of this machine, but as I said already to many other before you, consider this as a technology demonstrator (or a toy) and do not try to build it as your only printer.