LED Strip Aluminum Channel Parts
thingiverse
These endcaps are designed to work with "Aluminum LED Strip Bars" like those found on Amazon, specifically with products such as this one: https://www.amazon.com/gp/product/B0773HVGYK/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1. The dowel mounts fit standard 1/4 inch wooden dowels that can be easily obtained at most hobby stores and are typically the same width as most LED channels.
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