Hobby electronics assemblies ·
Mount a wound ferrite toroid in a cradle sized around the finished coil
Measure the wound ring and provide room for a soft liner. An annular seat, two strap tunnels and open wire routes support a tidy hobby-board installation.
Support the ring on your own test board
A finished ferrite toroid should not hang loosely from its winding leads on a hobby baseboard. This cradle provides an annular seat, a low inner boss and an interrupted outer rim. Two screw ears secure the cradle, while two narrow plastic straps gently retain the ring against its support.
Each strap runs from the centre opening through a radial tunnel beneath the seat, then returns over the corresponding section of the ring. Openings in the outer rim provide routes for winding leads. Keep these wires separate from the strap tunnels and arrange suitable strain relief at the connections.
Measure the complete winding
Measure outside diameter, clear inside diameter and height with the winding in place. Available ranges are 18–60 mm outside, 9–35 mm inside and 6–24 mm high. Starting values are 30, 16 and 12 mm. Include room for a suitable soft liner and the dimensional variation of your print.
Rim and boss thickness ranges from 1.8 to 4 mm, initially 2.5 mm. Seat thickness is 3–7 mm, initially 4 mm. Rim height is calculated as 35 percent of the entered ring height: 4.2 mm at the starting settings. The rim therefore locates the lower portion rather than enclosing the full height of the coil.
Check tunnels and fastening before assembly
Strap tunnels are adjustable from 3 to 8 mm wide and 0.8 to 2.5 mm high, initially 5 × 1.2 mm. Choose straps narrower and thinner than these passages so they feed without force. Seat thickness must exceed tunnel height by more than 2 mm. Inspect the tunnel roof in the slicer and smooth rough edges before threading straps.
Mounting holes range from 2.4 to 5.4 mm, starting at 3.4 mm. Screw down the cradle without distortion and tighten straps gently: ferrite is brittle and windings must not be crushed. Intended use is small passive toroids in extra-low-voltage hobby assemblies. It is not a mains transformer mount and carries no assured insulation, fire-protection or EMC function. Toroid, liner, straps and screws are separate supplies.
The image is an AI application visualization, not a photograph of a physically tested print. Accessories shown are not included in the STL.
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