Proposal about the main plate (cleaning, parralelism)

Because the parralelism between the screen and the main plate was not correct and also it was difficult to clean very well all the part, I decided to modify the main plate and the support.
The main ideas are:
Only on part to replace
Easy to clean (big angles help the resin to fall)
Other possible improvement: use the cavity inside the Main Plate as a tank of resin (please to request all modification, it is free)

Steps:
Put Manually the Main Plate on the screen
Fix the Top support
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