Update 14/03/21
Uploaded fixed bolts.

Update 27/03/21
Uploaded non-cutout version.

Update 11/04/21
Feel free to check out the Fusion 360 Model

The Gyroscup

Ever sat on a couch where the couch table was just too far away to conviniently put down your drink? Well here's the over-engineering solution to a problem you probably never really knew about until you read this text. The Gyroscup!

Why?
There are various solutions for self-aligning drink holders out there such as this, this or this. They're all great and serve a much more honorable purpose of helping people that might struggle not to spill their drink because of physical limitations.
But for me, I needed something that I could use to put down my glass of wine on the couch (i.e. with feet) without worrying about making a mess, so here we are. To answer the question of "why?": Well, let's be honest. It's simply because I can.

The Gyroscup has an inner diameter of 84mm and a cut-out, so you can also use it for coffee mugs and any other conic types of glasses or cups with a similar diameter. I've included the screws because my local hardware stores were closed down when I designed and printed this. Shout out to nut job, which was super useful. If printing screws seems a little laborious to you, you should also be able to just use regular M6 screws.
Update: If you prefer, you can now print the non-cutout version, as well. The advantage is that the rings should stay horizontal, if no glass is in the Gyroscup. The disadvantages are that you can't use Gyroscup for your mug and that you cant insert a wine glass from the side. It's up to you. It's not necessary to print the outer ring without the cutout if you want to save some filament. I just uploaded it in case someone wants to use it for aesthetic reasons.

What to print
What you need to print (and how many):

• Inner.stl or InnerNoCutOut.stl (1)
• Middle.stl or MiddleNoCutOut.stl (1)
• Outer.stl or OuterNoCutOut.stl (1)
• Foot.stl (3)
• bolt_6_short.stl (3)
• bolt_6_long.stl (4)
• nut_6mm.stl (7)

If I remember correctly, I printed everything with a 50% grid infill (except for the screws, where I used a 100% infill).

Assembly
Prettey straight forward. Connect the three rings with two long bolts each. You'll see which way around the screws go because they are countersunk. Next slide on the three feet where there are still unused holes left and connect them with the short bolts.
All of this should work out without the need for support, any extra parts or post-print work.

Enjoy your perfectly aligned glass of wine!