Lay the printed + / − stickers flat on a desk — no 3-D printer needed.
On scan, each charge floats above its sticker and a true 3-D electric field appears around it. The layout is then
frozen, so the field stays rigid while you walk around it — no jitter.
①Lay the + / − stickers (and optional electron-gun cards) flat on a desk.
②Start the camera and point at them — it auto-locks after a moment, lifting each charge above its sticker.
③Walk around to see the 3-D field; tap Re-scan for a new layout.
Each charge floats 2× the sticker edge above the desk (tune with ?lift=). Requires camera & HTTPS.