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Please keep in mind that you need to seal that print before you use it with food. Because of the layers, there’s are a ton of places for dirt and bacteria to hide that are impossible to clean. Additionally, depending on what kind of nozzle you used, heavy metals can end up in your print which you don’t want to then leech into your coffee. General advice is to just not use 3d prints first good, but if you really want to you should coat them in a food safe epoxy before using.
To play devils advocate here, Protons costs are not fixed. The storage, compute, and people behind your email (and other services) continue to cost more today than they did when you signed up. I would also expect, as a business user, that your prices to customers have increased at some point to cover higher costs of supplies and needed overhead. It seems fair for Proton to do the same and I wouldn’t expect this to be how it always works (and in fact I’d expect at some point in the future you’ll get hit with a catchup increase, either because you’ll need to change your billing cycle or Proton just can’t continue to deliver the service for what you pay on your grandfathered rate). As long as rate increases are not egregious and are well communicated by companies I respect, I see them as an unfortunate but fair way to keep those companies in business.