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I've never had an issue with belt tension. For Z, it's easy to slide the Z motor to adjust if it is an issue. For the carriage, I used the tensioners related to the Core-XY design of which this is a derivative.

It can be expanded. People have done 1m x 1m x 1m printers (e.g., http://www.thingiverse.com/unknown/about ). However, they invariably need to use four Z leadscrews rather than three for the build platform. I do not know at what volume they find that necessary. Also, they have to stiffen the X and Y linear supports to deal with sagging over those spans.