The short answer: make several flat pieces, iron them on one side only so the other side stays flexible, bend them into shape, and join the seams with glue or a second ironing pass. Start with a cube, which teaches every skill 3D work needs.
3D perler is not a different craft, it is flat perler with one extra trick: not melting one side. That trick is what lets a flat piece bend into a curve or fold into a corner.
The one-sided melt, explained
Iron the front of the piece until the beads fuse, then flip it and do not iron the back, or iron it for two quick passes at most. The back stays slightly soft, so the piece bends without cracking. A fully melted piece snaps when you try to curve it.
Beginner steps: the cube
- Make six identical square pieces, around 8 by 8 beads.
- Iron each piece on one side only and let it cool flat.
- Place four pieces side by side and join them into one long strip by ironing the touching edges together through paper.
- Fold the strip into a square ring, then melt the two ends together.
- Melt the top and bottom pieces onto the ring, one edge at a time.
- Press the corners gently to square it up while the seams are still warm.
What to build next
After a cube, try a box with a lid, a pyramid, or a heart box. Each adds one new skill: curves, angles, or moving parts. Our 3D patterns guide has ready-to-use designs, and the pattern library marks which ones are 3D. Beads, boards, and paper are in our shop.