In addition to the carabiner, you might need a buckle that attaches to a strap or MOLLE webbing on your backpack and, optionally, a locking pin to ensure the element won't slip away accidentally.
Both components can be obtained from the original QUICK-CLIP model https://www.printables.com/model/587654-quick-clip-gen-3-base-starter-kit/files for some standard strap sizes. I also uploaded those here as the contest requires completeness of a model. Additionally, I have created a narrow buckle for one of my backpacks, which I couldn't find elsewhere.
The carabiner gate plugs into the two holes on the carabiner and then tilts inside.
Here's a little schema of how everything fits together:
The print settings are similar to those of the original models, and no supports are required.
I tested this with PLA, and it held my keys securely even while riding a bike on a bumpy road.
QUICK-CLIP system carabiner for a backpack
by dixel · original on Printables ↗
Sports & Outdoor / Outdoor Sports
♥ 367⬇ 762🖨 9 prints
Print profiles
gate.stl
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quick-clip-carabiner.stlDEFAULT
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QUICK-CLIP - Buckle for 14mm Straps (real narrow).stl
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QUICK-CLIP - Buckle for Parallel Straps.stl
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QUICK-CLIP - Buckle for Perpendicular Straps.stl
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Standard Locking Pin (9mm).stl
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