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You could be the president of makerbot for all it matters, your machine could be $250,000, it doesn't matter..

If your machine isn't calibrated, it's your own fault. My pangolin is printing right now on my DIY $250 printer. It's printing FINE. I can see the joints halfway done, they are not fusing. There's a visible gap.

It's probably something like a 0.6mm clearance. Did yo scale the model down? Like the creator says not to? if your printer can't handle a 0.6mm tolerance, it may be time to consider a new one.