Yes, resizing is very easy, and a necessary "evil" in 3d printing. I don't think I've ever printed something exactly as scaled. I am almost always finding something supposedly scaled to 10mm but I want it in 15mm, or 28mm and I want it in 20mm. That doesn't even account for those models that are too thin, too long, too tall, etc. So even when I am looking at a 28mm model I often do something to it so that it looks the way I want it to. The software makes this very easy and I can't imagine a printing company not being willing to take a couple of minutes to get your order right.