#0054 Rugged Carabiner 5 - with a message

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This is a locking carabiner with a message: “CLIP-IN & CARRY ON", a 5th installment of my carabiner series.  It carries forward the analysis work done on the BX Carabiner, but is still a bit more rugged duty (thicker) and carries a message of resilience. It locks in the YZ direction, same as the BX Carabiner.

Recommendation: As with my other carabiners, keep the seam away from the snap geometry.  I suggest you put the seam at the inside bottom of the loop somewhere.

My other Carabiner Designs:

• Ergonomic BX Carabiner
• Rugged D Carabiner
• E's Carabiner
• J's Carabiner

Do you like the PETG colors I printed with?  They are here (please note - affiliate link):

Polymaker PETG Red: https://amzn.to/3JjhLan

Polymaker PETG Gray: https://amzn.to/3L5RE8a

Many Uses: Key rings, towel holder for camping, shower curtain rings, etc.

Tips: 

1. Print in PETG/ABS/ASA for more flexibility.  PLA is not recommended. 
2. Some minor welding is common at the snap area.  Just bend it back and forth in the Z direction and it will separate.
3. Print with 2 walls and 25% infill, 0.2mm layer is fine.  Recommend top and bottom layers to be at least 4 each. Given the print orientation, top and bottom layers have a big effect on stiffness. If you want a stronger part, go with 5 layers each - but beware that it may be stiffer than you'd like.  If you use any more layers, it may become too stiff for you to open it easily anymore.
4. If you scale the part up in size, you can experiment with more wall thickness and more top and bottom layers.
5. Try to place the seam away from the snap geometry area, like by the outside of the bottom knuckle instead - seams can collect excess filament in areas with small print movements that could cause welding at the snap area.
6. For the Y lock version: if you only scale in Z direction, you get a print that is more resistant to opening up while being twisted – it's functionality would approach that of the YZ Lock version. 
7. For general applications, you can just print it as is – some may prefer to be able open the clasp by sliding in Z direction.  The YZ version is designed to prevent unintentional sliding.

NOTE: The gap in the locking snap area is designed to be 0.2mm which is good for a generally well-calibrated machine.  If your print is welded together too tightly, it could mean your printer needs further calibration.  If you believe your printer is already well-tuned, one quick way to improve gap control in this area is to increase your print acceleration during extrusion so that not too much excess material end up in the snap area to weld it together (for my Prusa MK3S+ acceleration of 1000mm/s^2 appears to work well.)

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Happy Printing!