This is a mount for a filament run out sensor for the Wanhao I3 or Monoprice Duplicator I3 series of printers, I have it mounted on a I3 Plus but it should fit the V2.1 also.

It is made to fit most sensors but I used this one - https://amzn.to/2LsMdRO

Requires two M3 x 18mm screws and matching nuts.

There is also a area inset to allow usage of two sided tape or Velcro pads to help hold it in place on top.

Print Settings

Printer Brand:

Wanhao

Printer:

No

Supports:

0.125

Infill:

Notes:

Print on its side with supports for maximum strength.