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diy and diy-3d-printer - These seem very similar to me, but I may be wrong.
All questions under diy could easily be tagged diy-3d-printer and still make sense.
Merge diy into diy-3d-printer or not? Delete diy?
diy has no usage description anyway.
I have retagged all of the diy as diy-3d-printer and removed the diy.
In fact, 6 out of the 7 were already tagged diy-3d-printer.