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Time and money.
I work 45-53hrs a week as a draftsman and have a a lot of debt to pay off from a bunch of recent life-emergencies/helping family out.
I 3D print stuff from Shapeways for basic testing of designs, but I have a ways to go before making master originals in FUD/FED of parts to be used for making molds of. Pic related is a mix of nylon and polyurethane parts for a custom 1/12 harpy next to Figma Kanbaru for scale.