Ender 3 4020 mainboard fan and relocation

Designed this Ender 3 mainboard cover to fit a 4020 fan and relocate it. Doesn't interfere with the bed levelling knob and Y-axis wheels. The 4020 fan fits tight in place and doesn't require screws. Used a short M3 to screw in a printed 40mm fan grill for aesthetics and to keep some dust out.

Supports are needed for the fan screw holes, and be careful when removing these supports as they may damage the hole.

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