USB Rechargeable Soldering Iron: Solderdoodle Pro

Picture of USB Rechargeable Soldering Iron: Solderdoodle Pro
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Please click below to visit our Kickstarter project page for Solderdoodle Pro 2.0 and pre-order a production model!

Solderdoodle Pro is a portable, cordless, USB rechargeable soldering iron. It is based off my original Open Source project: "Solar Powered Soldering Station"

Specifications for the Battery and Circuit, including Gerber files, can be found at

After learning how to use 3D printers, one of my friends asked if there was such a thing as a USB soldering iron and I said that I had instructions to build one, but the battery was external. I then realized that I could create my own case design on a 3D printer and put the battery, charge controller, and other parts inside as one single unit! It worked! .stp files for the case are provided below.

Solderdoodle Pro Specs:

Solderdoodle Specs:
* Time to Fully Charge Solderdoodle @ 5V 1A: 3 hours

* Capacity: 3350mAh/3.6V * Type: NCR18650B Lithium-Ion

* Diameter: 1.5 inches * Length: 7.2 inches

* Charge Cable Length: 5 feet * Weight: 96g (3.4 oz)

* Input Cable - Male USB 2.0 Type A to Micro Connector

* Input - Current: 450 to 1300mA | Voltage: 5 to 6 Volts

* Output - Current: 1400mA | Voltage: 2.5 to 4.2 Volts

* Body Material: High Temperature Plastic

* Battery Life Under Typical Use: 5 years

* Replaceable battery * Provides over an hour of soldering

* Solder up to 24 gage thick wire (Flux recommended for lead-free applications, thicker wire, or large ground planes)

* Heats up to over 700ºF (371ºC) in just 30 seconds

* For use with leaded solder and lead-free solder

*WARNING: Be careful when handling any Lithium-Ion battery because shorting the battery can cause burns. Always wear safety goggles. Please use recommended battery and circuit components because of the higher 2000mA max battery charge current involved. 3D printed parts may warp under high temperatures.

FCC Compliance: NOT Required because the circuit frequencies are below 1.7MHz

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SamusAran283 months ago
Great instructable! Will be making soon!
Solarcycle (author) 6 months ago

Only 59 hours left in the Solderdoodle Pro Kickstarter campaign! Be the first to own one! Shipping in March or sooner!

turbiny6 months ago
Anyway to buy the parts and assemble it myself
Solarcycle (author)  turbiny6 months ago

I will have parts available to purchase after my Kickstarter campaign has ended. No other company will sell the parts only.

Solarcycle (author) 8 months ago

Solderdoodle now melts lead-free solder!

Solarcycle (author) 8 months ago

Solderdoodle Improved for Higher 700ºF Temperature!

I bypassed the 5V DC-DC converter and wired the heating element directly to the charge controller output and Solderdoodle was able to reach over 700ºF! I added photos of the improvements. I even used the Solderdoodle to modify the existing circuit! Solderdoodle specs will be updated to reflect the higher performance.

Solarcycle (author) 8 months ago

Uploaded a new revision for the 3D printed case. It only needs 2 screws now, has a better fit, and has the "ON" "OFF" text near the power button.

(removed by author or community request)
Solarcycle (author)  DELETED_JesusGeek8 months ago

This is just the prototype, the new production version will have an improved design aesthetically and electrically. The prototype was built with parts I had on hand at the time.

Apolo88 months ago

That is not an instructable but a show and buy

Solarcycle (author)  Apolo88 months ago

This is not even a product yet. Solderdoodle is DIY Open Source Hardware and you can even built it yourself!

AJMansfield8 months ago

These already exist...

Solarcycle (author)  AJMansfield8 months ago

Solderdoodle lasted over an hour with the power button held down the entire time according to the test I just did. It's now recharging on my laptop.

"Lasts over an hour" ... Has enough power to keep the LED lit for an hour, sure. Sustain temperatures needed to melt solder, I don't think so.

Solarcycle (author)  AJMansfield8 months ago

This test I did proves that Solderdoodle melts solder for hours.

vforgione8 months ago

Wouldn't Weller be a bit ticked off that you ripped apart one of their products to make it your own? I'm just wondering if there's a worry of patent infringement. Good luck to you.

Solarcycle (author)  vforgione8 months ago

Weller does sell heating elements separately on their website, so basically that's what I'll be doing. If anything, it helps boost their sales of soldering irons for people to hack. For whatever reason if Weller gets mad, which is unlikely, I would just have to design my own heating element.

Sweet! Looks like you have a good plan.

Solarcycle (author)  vforgione8 months ago

I just called Radio Shack and they have no problem with their soldering iron tip being used in another soldering iron:

I would imagine that other off-the-shelf parts are treated the same.

Solarcycle (author) 8 months ago

Updated case design is available. It has a better fit than before.

ndjalva8 months ago

WHY in the world would you or anyone want to put your little wallwart or computer power supply to do nothing other than melt some metal. The power supply for your little computer is running on. Juse the tool as it was designed and be happy.

BurgersBytes8 months ago

Why not just adapt the Weller unit to hold the 18650 battery? One would replace 3 AA. Then you would not need a 3D printer.

Solarcycle (author)  BurgersBytes8 months ago

The 18650 battery and charge control circuit doesn't fit in the Weller case, I tried that already.

wblakesx8 months ago

Kudos. Best of luck.

Solarcycle (author)  wblakesx8 months ago

Thanks! I'm still refining the case design, so stay tuned for updated revisions!

neilh8 months ago

Hmm. I don't see the specific PCB on the site mentioned, could you perhaps clarify where the exact files are please. Great write up.

Solarcycle (author)  neilh8 months ago

The link on the site labeled "DOWNLOAD POWER CORE CIRCUIT FILES" should have all the PCB files. Power Core is the USB solar charger circuit I used for another project and I'm now using it in the Solderdoodle.

cudy7899 months ago
Very good innovation off of the soldering iron, and best of all, portable! Great job!
Solarcycle (author)  cudy7899 months ago