Build Platform Holder for peopoly MOAI vat

Build Platform Holder for [peopoly MOAI 3Dprinter](https://peopoly.net) standard vat.
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Perfect to keep vat and buidplatform seal inside air tight container.
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- Official [peopoly support forum](https://forum.peopoly.net)
- Official facebook group >> [Moai Laser SLA 3D Printer Owners](https://www.facebook.com/groups/166212290569846)