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Z clearance only 55mm

Hi, related to the XYZ Carve, the blurb says approx 75mm under X carriage. Sounds good but when I build it I’m only getting about 50mm of clearance between the wasteboard and 2 bolts in the bottom of the z axis slide.

I’ve just taken it apart (minimally) to replace the z slide lower T nuts with post build T nuts. It still only gives me about 55mm clearance.

That’s even less than the Chinese 3020T that I’m upgrading from. Perplexed to say the least.

Any suggestions?

Thanks in advance
Peter