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Making Sonic With A 3D pen

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A Daejeon-based artist turns a heated plastic filament into Sega’s fastest hedgehog, one careful pass at a time.

Sanago doesn’t sketch Sonic the Hedgehog and call it done. In “소닉 만드는 장인” (“Making Sonic With A 3D Pen”), the South Korean artist and YouTuber — real name Kwon Won-jin — builds a full three-dimensional figure of the Sega mascot from scratch, using nothing but a handheld 3D pen, spooled filament, and a soldering tool to fuse and smooth the plastic into shape.

Sanago, a Hannam University arts graduate who started posting 3D pen content in 2018, has built a following around exactly this kind of slow, hands-on process video. There’s no green screen trickery and no time-lapse shortcuts hiding the work — just layer after layer of plastic taking the shape of one of gaming’s most recognizable characters.

• Sanago constructs a full 3D figure of Sonic the Hedgehog using only a handheld 3D pen and heated plastic filament — no molds, no printer.
• The build starts with a layered wireframe and structural volume before Sanago renders Sonic’s body, dynamic quills, fur texture, and sneakers in detail.
• Soldering tools and smoothing techniques are used at the end to refine the raw plastic surface into a polished, display-ready model.

Building A Character From The Frame Up

The video opens with what looks like a skeleton rather than a hedgehog — a raw wireframe laid down stroke by stroke to establish Sonic’s proportions before any color or detail goes in. Sanago builds structural volume first, essentially plastic scaffolding, so the figure can hold its own shape once the pen work gets more delicate higher up.

That patience shows in how deliberately the piece comes together. Every pass of the pen adds a thin bead of cooling filament, and there’s no rushing that chemistry — go too fast and the structure sags before it sets.

The Quills, The Fur, The Sneakers

Once the frame holds, the video shifts to Sonic’s signature features: the swept-back quills, the texture that reads as fur even though it’s all rigid plastic, and the red sneakers with their white straps. These are the details that separate a rough approximation from something fans would actually recognize on sight, and Sanago spends the bulk of the run time here.

It’s the kind of granular, skill-driven content that sits alongside other hands-on craft videos InfoSearched has covered, including the precision blade work in Satisfying Knife Skills – Cut Potato l Chinese Recipes by Masterchef, where the appeal is watching a specialist do something ordinary people simply can’t.

No mold, no printer — just a heated tip and a steady hand turning plastic filament into Sonic’s quills, one bead at a time.

Soldering And The Final Polish

The last stretch of the video is where the piece stops looking like a craft project and starts looking like a display model. Sanago uses soldering tools to melt and fuse rough seams, then smooths the surface so the plastic loses its stringy, extruded look and reads as a finished figure rather than a work in progress.

That finishing stage is really the whole pitch of Sanago’s channel: anyone can heat filament and drag it around, but getting a clean, gallery-ready Sonic out the other side takes the kind of repetition Sanago has clearly logged since picking up the format in 2018.

Sanago’s channel has built its audience one character at a time — Sonic here, other game and anime figures in separate uploads — and the appeal never really changes: a Daejeon art school grad with a pen, a spool of plastic, and enough patience to make Sega’s hedgehog look like it just ran off a shelf.