This is an adapter for the Skywatcher Star Adventurer GTI saddle mount. It adapts the 29mm by 29mm screw pattern to 38mm by 38mm. This allows to mount an aftermarket saddle with a better clamping mechanism.
The fit for the M4 nuts should be tight enough to hold them in place and lose enough so they can be pushed in easily.
Print with the bigger side down! The design comes with a sacrifical layer for nice bridging with no need for support.
The author marked this model as their own original creation.