10x Stronger Flex Door Carabiner ddf3d
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Max breaking strength of 120lbs @ 75% scale (6.7g of ABS) for a 10kg working load at 5:1. Held 205lbs @ 100% (15.8g).
- Ocena
- 5 / 5
- Polubienia
- 26
- Pobrania
- 145
- Wydruki
- 3
- Wyświetlenia
- 714
- Oceny
- 2
Aktualizacja u źródła:
Informacje o modelu
- Źródło
- Printables
- Kategoria
- Outdoor Sports
- Licencja
- Creative Commons — Attribution — Noncommercial — Share Alike
Testing of Rev 3
Print settings below.
I optimized the design for 75% scale for my specific needs, however I performed some one-off tests to see how it performed at different sizes. I recommend at least a 3:1 safety factor to avoid deformation and stress marks with light stress and 5:1 where the carabiner will experience more g-forces.
| Scale | Max Supported | Breaking Weight | Tests | Weight |
|---|---|---|---|---|
| 100% | 205lbs | 215lbs | 1 | 15.8g |
| 75% | 120lbs x 1 rep | 125lbs | 5 | 6.7g |
| 60% | 50lbs | 60lbs | 1 | 3.4g |
| 50% | 45lbs x 3 reps | 50lbs | 4 | 1.9g |
Note: At 75% and below, the carabiner seems to fail as a result of filament tensile strength – either at the hook on the main body, one of the top two bends, or in the gate. During the 100% test, the hook failed due to layer separation.
Print Settings
I found that there was very little difference in filament consumption (~7g total) between 50% gyroid infill and 100% concentric, however the filament paths for 100% concentric seemed optimal for strength and the prints were a bit faster.
Material : ABS
Sparse Infill Density: 100%
Sparse Infill Pattern: Concentric
Solid Infill Pattern: Concentric
Wall Loops: 5
Top/Bottom Layers: 5
Wall Generator: Arachne
Only one wall on first layer: False (unchecked)
Only one wall no top layer surfaces: False (unchecked)
Apply gap fill: Everywhere
Assembly
The keeper mechanism and longer catch/hook make the assembly a little trickier than the original, but still very similar. I suggest watching the assembly video provided in the original.
- Flex bottom part of the catch to break any attachment that may have formed during the print.
- With the part flexed, insert the bottom portion into main body hole as described in original video.
- With the part flexed (the top will be inside of the main body), spread the part and install catch/hook.
- Press hook/catch all the way in before closing carabiner.
Printing Small
The smallest I could get this model to print with o 0.4mm nozzle was 50%. Sizes below 75% may require using a hobby knife on the gate to unfuse layers and allow it to flex properly.
You may also need to break them in a bit to get them to close well. For this I move the gate open and closed several times to wear down any rough edges. I also apply 10-15lbs of force with the carabiner closed to help everything align correctly.