This is a indicator mount for the mk3 extruder setup that should be a simple print. It was made for a 9.5mm hole, which corresponds to the indicator shown in the picture (purchased from Amazon). The part has been separated into two pieces to avoid having to use support material, and they should easily slide together without issue (although I would recommending gluing them together).Glue the two pieces together to ensure a strong part. You might need to sand the hole a little to get a good fit in your indicator.