5-inch is roughly EM size. It can be affected by the size of the ship - both for GamePrint and EM it's true that long, narrow ships will turn out small despite having the 5-inch/12cm length at the widest point.
Here's a selection of EM and GamePrint ships side by side. All roughly same size, it turns out:
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How long does it take you to get the Gameprint ships ? I ordered 2 that went into production April 2nd & haven’t heard anything a month later.