Great idea, designed brilliantly. My buddy absolutely loves them (he's a HUGE F1 fan)
Only down side (and it's minimal) is the cans are a huge PITA to remove. They slide in snugly and stay great... but getting them out involves a few curse words...
Yeah I've noticed some cans, even from the same batch of drinks, fit snug while some fit loose. If you have a regular brand of drink you use these for, you can scale the model up by .5% at a time (only print say 2cm) and see if that fits better.
Glad you liked it otherwise!