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I know people use different fill rates, but on average, how much PLA could I expect per car? I'm interested in building 6-8 cars to use in my freshman-level transportation class. The only things we won't be printing are the rear axle and gears since we'll be machining those items in the machine shop to help meet some of the state standards. I'm going to print one entire car though as "prototype" before we start changing items like the rear axle. That leads to the first problem.

Also, we have a Flashforge Finder in the classroom and I haven't encountered any warping on it before, but I started printing the rear axle today and about 5-10 minutes into the build the ends started curling up off of the bed. The center section and the first to steps outside of it look great, but the two smaller diameter sections curled up enough that its not usable. Any tips would be greatly appreciated.