AUDI A3 8P (2003–2013) Single Cup Holder
Cup holders fits perfectly, just push it down and it fits tight, does not require any modifications.
Made it with professional 3d printer. The quality is one of the best you can achieve from this technology.
I made this to fit standard can size like coke, pepsi, etc. and for most popular cups like McDonald's or coffee cup from gas station (500ml/17oz)
Tunnel is made for AUX cable if you Audi has it.

Also have double cup holders option: https://www.ebay.com/itm/385071364589
Feel free to ask my any questions.