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Tried this in PLA, ABS and PETG and every time it's too tight. Both PETG and ABS snapped the thin points where the nuts go just trying to insert it into the A8 frame. PLA snapped them when I tried to tighten the big "bolt" to tension the belt. I think a solid design with smaller holes on the top of the 4 posts would work better so I can just thread a screw into the PETG without the nut.