Well every single piece of mine was cut to the exact size im mm+->0.5mm, and every angle was exact, as i measured every peice several times before putting them inplace. The errors have happened while welding casuing distortion and metal to twist. For example my chassis isnt completely flat on the board anymore, its risen about 2mm after welding in places, but the +-3mm i was talking about is what things like diagonal sizes between welding a square.
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