Flash Knuckles - Trench Knife Flashlight Adaptor
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A Brass Knuckles-style adaptor for a flashlight.
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- Creative Commons — Attribution — Noncommercial — NoDerivatives
The design now generally recognized as the trench knife was developed in the First World War. Its most distinctive feature is the hilt encircling the fingers, which prevents losing one’s grasp of the knife while in use.
Thankfully, very few folks today will ever need to use a knife in combat. But most of us use flashlights—often. And I do like the idea of not dropping my flashlight. This design is for an adaptor into which one can slide a flashlight. It doesn’t take up much more room than the flashlight itself, but allows one to hold it without flexing your fingers. Also, the handle can be reversed so that the light is outside the hand. One can grasp other tools or carry things while using this, and point the light in directions impossible with a headlamp. This design could help with any task which requires both hands and extra lighting.
It’s a relatively quick print (around 3.5 hours @ 75 mm/sec) and a good way to use up extra filament on something you’ll actually use. The hilt should fit most folks’ hands (my hands are about average size and fit comfortably). It is sized for a 3 ½” (81mm) x 1" (25mm) flashlight that uses 3 AAA batteries, a very common and inexpensive size readily available in the USA (and, I would assume, in most of the rest of the world). There is a tab which protrudes slightly into the hole for the flashlight, such that the flashlight is pinched in place.
• Material: I’d recommend PLA or PLA plus. It requires 34 g with recommended settings.
• Orientation: There’s only one flat face on the model. Place it on the bed.
• Supports: I try to design so that they aren’t required, but I couldn’t avoid it on this model. You'll need supports for the finger holes, but try to tweak the minimum supported area so that no support is generated behind the locking tab.
• Line width: 0.4-0.5mm. I used a standard 0.4mm nozzle.
• Walls/Top & Bottom Layers: 4
• Infill: Gyroid, 25%. But I don’t think this makes much structural difference.
• Suggestions: Print in glow in the dark filament!