Commercial Roller Blind oval bottom rail end cap
thingiverse
Picked up some commercial "Habitat Blinds and shading systems" 1.5” aluminum core 80"x80" inch black out roller blinds and sadly many of them were missing the oval bottom rail end caps. Thankfully there were 2, so I was able to copy and test them. This was version 4 and pretty much bang on, but depending on your material shrinkage, you may need to tweak. I included a photo of the aluminum bottom rail cross-section for your reference. Hope this saves someone else a bit of time.
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