Replacement Unicorn Horn for Playmobil Unicorns

Lost the horn off a toy unicorn? Print a new one in about 15 minutes.

Files

• STL: default.stl. Plain mesh, any slicer.

• 3MF: toy_unicorn_horn.3mf. Bambu Studio project with my tested settings (PrusaSlicer opens the geometry).

• SCAD: toy_unicorn_horn_mw.scad. The parametric source, for any other size.

My daughter's Playmobil unicorn lost its horn, so I made a replacement. It pushes into the hole in the head just like the original: a round push-in peg, a spiral horn and a rounded tip for small hands.

Which plate do I print?

• 1. Fit test set: Four horns in four peg sizes (3.5, 3.6, 3.7, 3.8 mm), each with a size tile; 1.3 g; 31 min

• 2. One horn: A single horn with a 3.7 mm peg, the size that fitted mine; 0.3 g; 16 min

Not sure? Print plate 1. There are four sizes so you can get a tight fit: every printer comes out a little different, and the tiles tell you which peg is which. On my printer the 3.7 mm peg was the one.

How to use it

1. Print plate 1, keeping each horn next to its size tile as you take it off the plate.

2. Try the pegs from smallest to largest. Keep the one that pushes in firmly without forcing.

3. Too loose? A dab of glue in the hole fixes it for good. Too tight? Try the next size down.

4. Need spares, or a different size? Open the .scad and set the peg diameter to the one that fitted.

Need something different? Customise in OpenSCAD

Download the .scad file and open it in OpenSCAD (free). Every option below is in its Customizer panel.

• Peg diameter and peg length, to suit other toys with a push-in horn

• Horn length, base and tip diameter

• Spiral turns, from a plain cone to a tight twist

Print settings

• Material: Any PLA (shown in PLA Basic Gray). Silk PLA silver gives it more shine

• Layers: 0.12 mm

• Walls and infill: 3 walls, 100% (it is small, so solid is best)

• Brim: 3 mm, outer only

• Supports: None

• Orientation: Upright, peg down, as supplied

Safety

This is a small part and a choking hazard. Not suitable for children under 3 years, and the toys it fits carry the same warning. Check the horn after printing for loose strings or sharp bits and give the tip a quick sand if needed. Adult supervision recommended.

Not affiliated with or endorsed by Playmobil. The name is used only to say which toys this fits.

The design and testing here are mine. The OpenSCAD was written with Claude, and every version was rendered and checked before it went up.

If it is useful, a like and a make with a photo really help. I read every comment.

Also on MakerWorld: https://makerworld.com/en/models/3352157