JAP LCD Printer (Improved)

WORK IN PROGRESS
Update 2019-05-05: Added 'Variants' section, filled 'BOM' section


Summary
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LCD printers become more and more popular as provide incredible printing quality and getting more and more affordable. LCD printer is a type of photo polymer printer - it cures resin with UV light layer by layer. UV light is masked with regular LCD matrix - black pixels displayed on LCD prevent resin above the pixels to cure.

One day I found [JAP LCD 5.5 printer](http://3dtoday.ru/blogs/3dlab/the-first-acquaintance-with-jap-lcd-55/) on internet. It looks pretty simple to build and set up. Studying its drawings and BOM I realized I already had number of parts, but they were slightly different from ones suggested by author. Additionally I was not happy with some of the technical decisions. So I decided to make an improved clone.

Basically this printer is a DIY analog of mass produced printers such as Wanhao Duplicator D7 or KLD-LCD1260, providing basically the s