It may not be so simple depending where the stresses are on the printed item as it may split along the printed layers. 3d printing does NOT produce a solid plastic part and you’re way better off with a well designed object with holes included than try to drill them as its likely to split plus also not be perfectly aligned. Why not just use washers like everyone else as spacers? Plastic and wood is compressible and if i understand your description you need metal or concrete solution. You’ve jumped to 3d printing as your solution and i think you’re wrong. Tightening bolts will compress a spacer and one each side means you’ll be uneven.
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