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where are the files (INO, STL ?)
Instead of the Erythritol it's better to use brown sugar, as the Erythritol has unpleasant side effects and as you use cream cheese calories is not an issue...
This is a ready made woodcraft piece. but as it's build you can use a triangle red wood profile size 15 mm, it has 4 equal equilateral triangles, each side is glued. the angle of each corner is 60 degree, so the end of each side cut to 30 degree.