This is an eco-cup holder made for parties or a daily use.
The 25/33 cl model need some further tests to be sure that it fits to most of them.
The 50/60 cl model is not tested yet.
You can use a string or a ribbon to wear it around your neck.
PRINT IT UPSIDE DOWN
I designed it in order to be printable without any supports. The bit of bridging that is needed should be handled by all printers.
I print it at 0.4mm with a 0.8mm nozzle with no infill and 2 perimeters. Luckily it is strong enough and it takes only 1h to print because I need to print more than 50 of them !
For better results you can print it at 0.2mm with at least 20% infill.