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The Mars 2 Pro seems to have more than it's fair share of problems...
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Hey there!
just wanted to let you know (and in case someone stumbles upon this with the same problems): Replacing the screen did solve the issue fully!
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The LCD screen is a weak point in this technology--not due to any attempt at cost saving or other shortcoming on the part of any manufacturer, but rather due to the near UV¹ curing light's effect on the liquid crystal, the "LC"component of the display. The light eventually hardens the liquid crystal blocking their ability to "twist" when electricity is applied.
To back up a bit, the LCD shutter has three important layers, two passive and one active. THe passive layers are lower and upper polarizers arranged "out-of-phase" with each other so as to block light transmission through the stack (light polarized by the bottom layer cannot pass through the top layer, inb'twixt these two is the active layer, comprised of numerous cells each electrically accessible and containing liquid crystal material--when an a voltage is applied to a cell the LC "twists" re-orienting the light so that it can pass through the top polarizer and initiate curing of the resin.
Unfortunately prolonged exposure to the short wavelength light hardens the liquid rendering (no pun intended) the LCD shutter useless.
Monochrome LCDs resist this damaged better than colour LCDs, but nonetheless they are not immune and do fail. Elegoo warrants its colour LCDs for 3 months, the monochrome devices for 6 months. My experience with the colour shutters has been they are go for 250 to 300 hours of print time. Te monochrome LCDs do better, maybe lasting up to twice as long.
The printing issues ("melted", wobbly, perforated, etc.) introduced in this thread are 110% classic indications of a failed LCD shutter which in any printer a year-old or more should be the first suspect when such symptoms are observed--in fat if your color LCD printer is over 6-months-old nd has benn used even modestly (1-2 hours/day) you should order a new LCD now as you wil be needing it. Those with monochrome shutter printer a year or more old--again with even modest use--should do the same.
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¹ - The "UV" curing light in our printers is not really UV, at 405 nm wavelength it is humanly visible light at the deep blue.violet end of the visible spectrum).