Multipart Base tonge-and-groove
myminifactory
Print with the flat side to the buildplate or add your own supports as to your preference. Scaled to 51x50mm for a 100mm base (the tonge adds a little on one side). Can be scaled to any basesize (though I have only tried 130mm for now). Oval should be easily possible, just make sure you scale the parts along the correct axis, so groves and feathers line up as they should.
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