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MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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I printed one enhanced version in Colorfabb PLA (the one in the picture). Since then, I put a FEP sheet and it's been sitting like that for 4 months.
There's already a slight warp toward the middle (tension from the FEP) but it's still usable. The VAT doesn't leak or cause issue with printing.

But the PLA is already not stiff enough so I wouldn't recommand ABS plastic for the job.
No magic here, plastic can't be as strong as aluminum like the original VAT.