A handle for Nicknack reusable cups.

To attach it to the cup, you have to slide it into the cup clip from below, twist it up at 45° angle and click it in place (see photos).

I printed mine in PLA (might be weak for hot beverages) with 4 perimeters and 15% cubic infill.

It is designed for 0.5 liter cups. For 0.4 liter cups, 93% scale should be just right, but measuring first is recommended.