Link to Onshape model: Gridfinity-Hytera-MD785G

This case is designed to be printed in two halves to minimize the need for support material. 

This approach results in the Top Cover being printed upside-down, which creates a very challenging 252 x252mm elevated surface that acts as a bridge. 

Initial attempts to achieve a smooth surface without support failed (as seen in the accompanying image).

Based on extensive testing and techniques derived from the YouTube comments on Absolutely PERFECT Unsupported 3D Printed Bridges! How 3 YouTube comments created a new technique by Make Wonderful Things, a smooth final result was achieved by utilizing support alongside highly specific print modifications. 

The successful parameters, which are already defined in the 3mf file, include setting the bridge flow to 1.2, defining modifying parameters at the walls to eliminate edge problems (instead of the 1.7 for the bridge), orienting the bridge direction at 45 degrees, and setting the print speed to a slow 10 mm/s.

Since the design incorporates a 6x6 Gridfinity base, it can be printed on any 254x254 print bed, such as the A1 used during development.

For final assembly, simply glue both printed parts together with superglue. 

Secure the MD785G transceiver within the case using headless hex M6x20 bolts through the foreseen mounting holes to prevent the unit from sliding.

73 de ON4AWM Walter