This is a simple soldering jig to make it easy to solder on the header pins for the GY-291 ADXL345 accelerometer. If you don't know what that is, then you probably need to read up on how to print 3-10x faster with your 3D printer using input shaper. Basically the ADXL345 only costs about $6-$8 and will measure the vibrations of your 3D printer using a few simple tests. Once complete, you will get a set of values that you put in your printer configuration settings.

Using input shaper allows you to take an Ender 3 v2 (for example) that has a top speed of about 100mm/s and print at 500-2000mm/s with high quality.

You can read up more on input shaper at the following link: https://www.klipper3d.org/Measuring_Resonances.html?h=accel

One of the most common and cheapest accelerometers is the ADXL345 this soldering jig is made for. It is also the one used in the link above on Klipper's official site. This simple jig makes attaching the pins a breeze, keeping them perfectly straight and flush.

If you are interested in picking up a GY-291 ADXL345 accelerometer I have provided a few links below. You technically only need one, but I have 4 printers so I bought 5. One is permanently attached to the printer head (lots of mounting brackets found on this site for whatever printer you have more than likely), and the extra 5th one I clip to the bed when I measure bed vibration. You don't have to measure resonance often unless you use a broad spectrum of filaments that print at very different temperatures. That is the benefit of having four printers... I print PETG on one printer, then usually have a different color of PLA loaded on to each of the other three printers.

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GY-291 ADXL345 Accelerometer on Amazon:
https://amzn.to/4bkBWjE

Soldering Irons and Solder:
https://amzn.to/3y02rMG

DuPont Cables to connect the ADXL345 to your Raspberry Pi/Arduino/ESP32:
https://amzn.to/3UDvYVs