The Diamond Ice Maker (DIM), a two-pieces model to produce your own diamond-shaped ice cubes!
The ice pieces are around 26 mm in diameter, the mold comes with 6 spots that can be water-filled from the holes in the upper part. The print weight is around 100 g for the two pieces together (20 - 30% infill).
While the parts are made to have a nice fit with small gap (0.5 mm), you may want to scale down the upper part (0.5 - 1%) should you have issues assembling the mold.
The author hasn't provided the model origin yet.