The U.S. Food and Drug Administration recognizes only one method as permanent hair removal: electrolysis. Now, a resourceful maker known as [n3tcat] has taken that science into their own hands, constructing a home-built galvanic electrolysis machine that could slash costs from thousands of dollars to just a few hundred.
“The idea was to prove you don’t need a commercial clinic to get permanent results,” says [n3tcat], whose detailed guide is making waves in online maker communities. The DIY rig uses a low-voltage current to generate lye inside the hair follicle, killing the root without expensive equipment.
Background: The Science and Cost Barrier of Electrolysis
Electrolysis works by inserting a thin needle into each hair follicle and either heating it or passing a current through it. The galvanic method specifically creates a chemical reaction that produces lye (sodium hydroxide) at the hair bulb, destroying the growth cells. According to the FDA, this is the only technique they classify as permanent hair removal.
Commercial electrolysis can cost anywhere from $50 to $150 per session, with full-body treatments often exceeding $10,000. That financial hurdle drives many to seek cheaper alternatives, despite the risks of improper technique.
[n3tcat]’s journey began with a raw experiment: “I just grabbed a 12-volt car battery, a standard electrolysis needle, and an aluminum can as the return electrode. It worked – but it was crude and unsafe,” they explain.
The Build: From Car Battery to Precision Microcontroller
The early prototype proved the concept, but [n3tcat] quickly moved to a safer, more controlled design. The heart of the new machine is an RP2040 microcontroller, powered by a 3.7-volt lithium battery. An OLED screen and a rotary encoder serve as the user interface, while a foot pedal triggers the current.
A boost converter raises the voltage to around 15 volts for the treatment needle, but a current-limiting circuit prevents excessive delivery. “I paired a digital-to-analog converter with an LM358 op-amp and a MOSFET to precisely control the milliamps hitting the follicle,” [n3tcat] notes. The RP2040 monitors current through a dedicated analog-to-digital converter, ensuring accuracy.
To improve ergonomics, the needle sits in a 3D-printed pen-like handle. All components are mounted on a custom PCB and enclosed in a sleek 3D-printed housing. Design files are available for anyone wanting to replicate the project.
What This Means: Affordable Permanent Hair Removal
With commercial electrolysis costing hundreds to thousands of dollars per body area, a DIY machine that costs around $150 in parts could democratize permanent hair removal. However, experts warn of significant risks if the device is misused.
“Improper insertion or excess current can cause scarring, burns, or hyperpigmentation,” says Dr. Emily Tran, a dermatologist not involved with the project. “This is a medical device – building it at home requires strict adherence to safety protocols.” [n3tcat] agrees, emphasizing their guide includes warnings about pain, skin damage, and the need for sterile techniques.
“I’m not a doctor,” says [n3tcat]. “This is for people who understand the risks and want to take control of their own treatment. Stay safe out there, hackers.”
The project represents a fusion of maker culture and medical self-care, but it also raises ethical questions. Should such devices be unregulated? The FDA has not commented on this specific build, but traditionally, home-use electrolysis machines must meet safety standards.
Until such regulations evolve, [n3tcat]’s machine stands as a powerful example of what an informed hobbyist can achieve – but only with caution and respect for the science involved.