20 mm square to 25 mm round converter
thingiverse
I'm uploading this file now so I don't risk losing it, a circular piece that's 25 mm in diameter and 4 mm thick with a 1 mm deep square insert measuring 20 by 20 mm for the models that work on both square and round bases and are positioned on a 20 mm grid since they usually run on 25 mm rounds. The corners will stick out over the edges due to Pythagoras' theorem and it may look odd, but it should still function and I just wanted something straightforward and practical.
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