LM2596 Buck Converter Ender 3 rail box
thingiverse
It's a compact rail enclosure for a LM2596 Buck converter that fits perfectly onto an Ender 3. To print this case, it will require supports during printing, but the lid can be printed without any additional support. The assembly snaps together securely, although you may inadvertently snap it if you try to pry it off from a rail, so make sure everything is measured and set before attaching it to the frame.
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