Can someone please give me a suggestion on how to gauge if there is enough printer filament left on a spool for a particular print I am about to make? What's the best method of doing this, as I don't want to leave the house and come back only to find out that I ran out of filament. Is there a measurement method, or do I have to weigh it and then know exactly how many grams my expected object will be when printed? I assume there has to be a way of going about this, but I can't for the life of me figure out what everyone else is doing. Any suggestions?