Hi, tiedemies [from US?],
you are the first one to react, but I am sure there are more Gibson Robot Guitar owners with the problem of broken rubber bands.
I have tried hard to find rubber bands with the dimensions 0.7 mm (cord size) x 1,3 mm (diameter), but there are none. Really annoying.
Someone sent me bands a bit thicker, but they were too long. I tried to shorten them and wanted to glue them together, but it has not worked yet. I have just got Loctite 406 and will have another attempt on glueing.
If Loctite works, the next thing to do will be to buy a band sold by the meter and glue my own bands - as I have (like you) some more bands broken.
I will keep you informed, if you like.
Have a nice day!
PS: One thing I read about was to produce bands with a 3D scanner or with plaster cast etc. - if everything else fails, I will try this as I know a dental technician familiar with this.