Khung giữ đồng hồ cho MFJ-267

The meter on an MFJ-267 Watt Meter and Dummy Load is held in place by a custom nylon retention bracket. If the unit is dropped, the bracket can break. This part replaces the OEM retention bracket.

My repair part allows the reuse of the factory screws if printed (in PrusaSlicer) with a 10 mm solid bottom layer as follows:

Horizontal shells
Minimum shell thickness:
Bottom: 10 mm

Alternatively, you could try increasing Perimeters. 

Install the bracket with the embossed arrow pointing at the meter's back side.