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4 Joint Pliers

3D printable needle nose pliers with four joints.

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We had a school project to make a pare of 3D printable pliers. I wanted mine to be useful, so I started thinking. I ended up making a pare of needle nose pliers that extended using four joints.

I started off thinking that I could make a vise grip, because I use those all the time. But then I thought about my RC car. I love working on it, but recently lost my needle nose pliers. I decided to make a pare, but I wanted mine to be an improvement. I thought about the small spaces and crevasses that where hiding all over the place in my 1/18 scale RC car. I wanted to make a pair that where extendable, but still very small. I thought of how a car jack worked, and decided to do something like that. I made a couple concept sketches.

My first design worked out well, but was week at the joint sections. I also designed it way to small, and had to scale it up in Cura. I printed it at 20% infill. The handles where also very small. I connected the joints using four small nails, but the ended up bending, and where not ideal. 

I went back in and made the handles bigger. I added small stoppers to help protect the joints from bending. I also scaled it up more in Cura, and printed at 30% infill. 

I just connected the joints with four small screws. There are no nuts, or washers, because I could not find any that would work. 

Here is a comparison of the two. I scaled the first one up by 200%, and the second one by 250%

pliers pin.SLDPRT

This is the pin that connects the joints in the assembly.

sldprt - 125.50 kB - 10/15/2018 at 14:16

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pliers part2.SLDPRT

This is the solid part for part one of the pliers.

sldprt - 229.17 kB - 10/15/2018 at 14:15

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pliers part1.SLDPRT

this is the solid part for part two of the pliers.

sldprt - 285.20 kB - 10/15/2018 at 14:14

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pliers part1.STL

STL for part one, or the handle. If you are printing, you will need two of these.

Standard Tesselated Geometry - 118.05 kB - 10/15/2018 at 14:12

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pliers part2.STL

STL for part two, or the tip. If you are printing, you will need two of these.

Standard Tesselated Geometry - 31.72 kB - 10/15/2018 at 14:12

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  • 1 × Printed Parts You will need two of the 'Part 1', of the handle to the pliers, and two of the 'Part 2' or the tips.
  • 4 × Screws You will need four screws, one for each joint. You can use anything that will work, but all four screws must be the same.

  • 1
    Printing the Parts.

    You will need two of each part, four parts in all. I printed them with 30% infill, and scaled them up by 250% 

  • 2
    Assembling Parts

    You should have four parts to work with. You will need four small screws. Lay out the pieces so that they overlap and create the pliers. Thread the screw through the top piece and into the piece behind. Make sure that the screw goes all the way through both pieces, it is OK if it sticks out the back.  

  • 3
    Finishing

    Once you have all the joints connected, check to see if the pair of pliers close. If not, you may need to sand down the print. Where the pliers tips meet, towards the joint, will most likely need sanding. I just used a Dremel to sand it down quickly. 

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