Congratulations on becoming a BX owner. You have in your posession one of the most capable 3D printers in its class with some unique features that you will not even find on other, more costly machines.
Despite the capabilities of the machine, it will only be able to perform well if you take the time to carefully ensure that the mechanics are well put together. Fortunately the BX is a very simple machine to assemble so if you follow this guide carefully you will not have any problems.
The BX comes with the frame already pre-assembled. All you will need to do is align it with the base and insert four bolts to hold it in place. Unfortunately the process involved in trimming the aluminium extrusions to length at the factory does not always result in a perfect, 90 degree cut. This means that after you fasten the uprights in place they may not be at 90 degrees to the base.