The difference being that professionals don't generally buy $250 3d printers - and when they do, i expect they do factor those costs in. The difference is that

The difference being that professionals don't generally buy $250 3d printers - and when they do, i expect they do factor those costs in. The difference is that professionals get paid and they know the value of their time. If you cannot rely on free labour, factoring in associated costs is important.