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3) Loosen the “vat fixed screw”, take down the resin vat, and
put a piece of A4 paper on the LCD screen. Move down the
building platform to home position, press and hold the
building platform, then fasten the leveling fixed screws.
4) Drag the A4 paper and feel the force of dragging the paper.
The leveling is suitable when it needs some force to drag the
paper. However, the home position is high when it can drag
the paper easily. On the contrary, the home position is low
when it needs large force to drag the paper. Then it needs to
level the platform again.