Canon 28-135mm Lens Hood
thingiverse
I printed out the lens hood by VHMaple and it kinda crumbled in my hand. It could be entirely my printer and settings, but I edited it to make it a little thicker anyway. When I printed mine, I ended up having to scale the hood to 99% to get it to fit a little more snug. I guess your mileage will vary. It does not lock on to the lens, but fits very well and really seems like there won't be any problems with it falling off. It also will fit on the lens backwards, though you can't zoom with the lens this way. I printed it in PETG at 100% infill to make it a little more durable too.
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