I didn't like the stock knobs on the Neptune 4, so I designed an alternative. This knob is 10mm larger and has a knurled texture for a better grip. Instead of using a threaded insert, I opted for a M3 nut. Just press in the M3 nut from the flat side of the knob and use a M3x20mm screw on the other side to pull the nut into position.  The knob can be used for both the X and Y tensioners.

Elegoo Neptune 4 Tensioner Knob

Elegoo N4 Tensioner Knob v3.stl

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Elegoo Neptune 4 Tensioner Knob