A compact quick-connect buckle for securely attaching straps to items such as cameras, binoculars, and GPS devices. Designed to remain firmly in place—it will not come loose on its own or open under load. 
 

Now includes Heavy Duty(HD) variants which are stronger. See the clip with the crane scale in the images, 70kg was reached with the HD variant in PETG HF before it broke. But keep in mind every print and printer might lead to different results, so please do your own testing.

Available Sizes:

• Round 7 mm – Ideal for thicker ropes
• Slot 9 mm – Suitable for small straps
• Slot 11 mm – Perfect for camera straps with thin ends
• Slot 21 mm – Designed for wider straps, such as typical lanyards
• HD Round 8 mm – Ideal for thicker ropes
• HD Slot 9 mm – Suitable for small straps
• HD Slot 11 mm – Perfect for camera straps with thin ends
• HD Slot 21 mm – Designed for wider straps, such as typical lanyards

Printing Guidelines:

• Print by object to maximize layer adhesion
• Layer height 0.16 mm for improved detail and overhangs
• Wall count 4 for added stability

Assembly & Usage:

Create a loop using sturdy thread. I used Paracord 350 with the 3 mm bead, this is stronger than the buckle and has some reserves. Paracord 125 fits in the 2.5 mm variant. Insert the loop, push to tighten, and pull on the side with the knot to release the buckle when needed.
 

See also my other camera related models.