Comment by ajsnigrutin

OnShape (web based 3d editing software) is like this. They have a free tier with public-documents-only option, and it's same there.

Open the page... you have to log in, no way to remember you. Sure, you save your password in the browser, but unless you then also click into one of the input fields, the login button is disabled. Then you work on some 3d stuff, export the file, send it to the 3d printer, some time goes by, browser still open, you get the object, and the holes don't line up, you forgot the wall thickness in the measurements, calipers, yep, 3 more milimeters... open onshape tab, nope, you've been logged out. I didn't even close the goddamn window/tab, it's a free account editing a public document.