What is purpose of MP-30 build plate? Can’t we use any other build plates?
MP-30 is designed specifically for printing polyolefins such as PP, PE, HDPE, LDPE, and LLDPE. For these materials, MP-30 is the only build surface that works reliably. See : Polyolefins
If your current use focuses on materials typically available as filament (PLA, PETG, ABS), there is no immediate need for MP-30. In fact, many of these materials do not adhere to MP-30 at all.
MP-30 becomes necessary if you:
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Plan to print PP / PE and related families
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Plan to recycle general plastic waste such as shampoo bottles, plastic bags, plumbing pipes, or electronic housings
These materials are almost always polyolefins.
Some exceptions:
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ABS and TPU (common in higher-quality housings) adhere well to standard PEI plates
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Water bottles (PET) also print well on standard build surfaces
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PVC should not be printed at all, as it emits toxic gases and can corrode metal components