Step 1: Make 20mm x 20mm cube
Step 2: Extrude cut circle
Step 3: Extrude cut text "TEST"
Step 4: Face fillet
Step 5: Extrude cut "X"
Step 6: Extrude cut initials
Step 7: Chamfer side
Step 8: Chamfer corner
Step 9: Extrude cut polygon
Step 10: Extrude boss circle
Step 11: Fillet circle
Step 12: Extrude boss initials
GIF in Solidworks
GIF in Prusa Slicer
Original Designs (Did not work)
Sketch of new chain
Step 1: Extrude 20x20mm square
Step 2: Sketch and extrude cut star emblem
Step 3: Sketch and form block extrusion on either side
Step 4: Extrude cut initials
Step 5: Extrude cut opening
Step 6: Sketch and form second block extrusions
Step 7: Sketch and extrude bar
Step 8: Fillet edges
Finished GIF
Assembly showing hidden lines