Fidget OTF Knife V2

Fidget OTF Knife V2

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645
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257
GIF

Print Profile(2)

All
P1S
P1P
X1
X1 Carbon
X1E
A1

AMS - 0.2mm layer, 2 walls, 15% infill
AMS - 0.2mm layer, 2 walls, 15% infill
Designer
1.7 h
2 plates
4.4(77)

Fast print - NoAMS - 0.2mm layer, 2 walls, 15% infill
Fast print - NoAMS - 0.2mm layer, 2 walls, 15% infill
Designer
1.1 h
1 plate
4.2(42)

Open in Bambu Studio
Boost
645
1054
257
89
1.9 k
1.2 k
Released

Description

The OTF Knife V2 is quick to print and functions smoothly. For the mechanism, you’ll only need a rubber band. The model consists of 5 parts, which can be printed quickly and are very easy to assemble.

  • Print time: approx. 1 hour
  • Weight: approx. 30g

Assembly Note:
Ensure that the surfaces where supports were used are clean and even after removal to guarantee smooth operation of the knife.

 



Alternatively, you can also fold a long rubber band.

 

 

 

Important


You can see the current rubber bands I am using here. 

I use 2 x white (approximately 1.4mm-1.5mm in thickness and about 30mm in diameter) 

or 1 x green (approximately 1.5mm in thickness and about 65mm in diameter) 

 

 

 

The ordered rubber bands have arrived, and I can confirm that the following rubber bands are compatible! 

 

1 x RA012 - 1.4mm x 28mm 
or
2-3 x RA004 - 1.4mm x 35mm
or
1 x RA008 - 1.4mm x 60mm

You will need to fold the RA008 rubber band once, or you can use one RA012 instead. Alternatively, 2-3 of the RA004 rubber bands will also work. 

If any issues persist, please let me know. Thank you!

 

 

 

 

 

 

Explore my tools:

Bill of Materials

Maker’s Supply Kits and Parts
Bambu Filaments
A00-P6-1.75-1000-SPLFREE
× 1
A02-D2-1.75-1000-SPL
× 1
A00-G6-1.75-1000-SPLFREE
× 1
A12-Y0-1.75-1000-SPL
× 1
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Download BOM

Comment & Rating (257)

Please fill in your opinion
(0/5000)

Works perfectly 💪🏻 You gotta make sure all edges are smooth in order to perform. Thanks!
The designer has replied
2
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@user_2327438490 Thank you for taking the time to review my model and giving it such a great rating. It looks fantastic! 👍
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Replying to @Tommy3DLab :
Actually, now I’ve noticed that I didn’t ranked you at all. How can I add ranking?
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Replying to @Hazan460 :
@Hazan460 I see you’ve already found it. Thank you for taking the time! I really appreciate the great rating. Enjoy the model! 😄👍
0
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Print Profile
AMS - 0.2mm layer, 2 walls, 15% infill
it works. Though the support on either ends of one part was extremely hard to remove. The part in the right of the photo also requires some bending to achieve optimal spring action. Finding the right amount of elastic bands was a bit tricky.
The designer has replied
1
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This is what I'm saying! Up
0
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Saw your comment as well. I wish the bend angle will be adjusted in the CAD model. Maybe it has something to do with material rigidity? I’m use PLA so it’s pretty bendy, not rigid enough
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Thx! 👍
0
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Print Profile
AMS - 0.2mm layer, 2 walls, 15% infill
was not working, but the print profile was great
The designer has replied
0
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@Jonah_X Thank you for your great review! The print looks clean, so it's hard for me to pinpoint where the issue might be. However, I assume it could be related to the rubber band. Are you using the rubber bands from Bambu?
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Replying to @Tommy3DLab :
No. I was also thinking it might be the rubber band as it seems like their weren't enough force applied.
0
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Replying to @Jonah_X :
@Jonah_X Some people made this mistake, thinking that more power equals better performance. In reality, there's a fine balance of force needed for the mechanism to function smoothly. Start with less tension and gradually increase the rubber bands. If the tension is too high, the safety mechanism will trigger too early, and the blade won't extend or retract properly.
0
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Print Profile
AMS - 0.2mm layer, 2 walls, 15% infill
great quality but can’t get to the blade in and out for the life of me. tired multiple bands.
The designer has replied
1
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@IReaper The rubber bands shouldn’t be too strong, as this could cause premature activation or sticking. Try starting with a weaker tension and add a rubber band if needed. Thank you for your feedback!
0
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I’ve found that the blade side detent release ramp is too far forward, meaning the ramp barely pushes the spring far enough down to release the blade back into the housing, I’m going to try adding .025” parallel to the ramp to see if that helps
0
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Print Profile
AMS - 0.2mm layer, 2 walls, 15% infill
printed out Great and works amazing! :)
The designer has replied
2
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@Tarik77 Thank you for sharing and for the great review! 👍😌
0
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Print Profile
AMS - 0.2mm layer, 2 walls, 15% infill
Great Design!
The designer has replied
0
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@Strykeforc3 Thank you! 😃👍
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that color combo amazing🤩
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not a perfect design. but it works really well if you deploy aiming down, and retract aiming up. overall a really good design. though I would advise using RAO12 RUBBER BANDS
(Edited)
The designer has replied
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3d innovative creations Thank you for your feedback. Unfortunately, I have to tell you that the knife with the RAO12 performs terribly. I’ve tested all the rubber bands from Bambu, and the ones mentioned above work really well.You tested the knife correctly, but it turns out that it doesn’t function smoothly. The RAO12 is too strong and triggers the blade’s spring release far too quickly, preventing enough force from building up. In fact, the blade can even deploy when it’s pointing upward!
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Replying to @Tommy3DLab :
after I made this post I found that it works pretty consistently with The Rao 12. I tried rao4s and it was too weak. it wouldn't eject the knife far enough to lock into place up top so that it could be retracted. if you've got a better one I'd appreciate it. what would you recommend.
0
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Print Profile
AMS - 0.2mm layer, 2 walls, 15% infill
Great print🙂
The designer has replied
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@glapglap Thank you for the wonderful review and for sharing! 👍
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I have tried a ridiculous number of rubber bands and I can't get it to work. Either the spring is too weak and won't deploy it or the spring is too strong and the release mechanism bends and does not release. I think if the release mechanism at the top of the inner part was slightly longer it would hit the bottom of the blade and release it even with a stronger rubber band. I love the design. It looks great, just wish I could get it to work. It could absolutely be a me problem because apparently others figured it out.
The designer has replied
0
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@user_3696857005 Yes, the model is more of a curse than a blessing. Some manage to get it working, while for others it just refuses to function properly. I can tell you that, unfortunately, I designed the model to work with the rubber bands from Bambu. It's a fine balance of force needed for everything to function smoothly.If the rubber band is too weak, the blade doesn't have enough power to deploy. If the rubber band is too strong, the mechanism triggers too early!
0
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Print Profile
AMS - 0.2mm layer, 2 walls, 15% infill
Great!
The designer has replied
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@LeonShapeLabs 💪 Thanks! 👍
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License

This user content is licensed under a Standard Digital File License.

You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.