Fidlock universal bottle holder to Nalgene

thingiverse

I use this item to put my nalgene bottle into the fidlock universal bottle holder. The issue without using this adapter is the radius of the bottle holder is too small for the size of the nalgene bottle so it puts some flex into the fidlock holder that is not good. This adapter fills in the gap. I have seen my bottle slip slightly because the plastic on the bottle side does not have high friction but this can be fixed several ways depending how you want to go about it, foam insert, glue, tape, etc. Photos in post-printing