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This thing converts a normal M3 nut into a M3 thumb compatible thumb nut.Print as normal and use a file to widen the hole until it is able to be threaded onto the bolt.
M3 Thumb Nut
Order summary

M3 Thumb Nut
Color:
Quantity:
Subtotal
$
Delivery (Jul 13 - Jul 15)
Free
Total
$