There are many off-the-shelf tires available for RC cars. However, the selection remains limited when unusual sizes are required, a special tread pattern is needed, or the appearance must match the scale exactly. In such cases, “Build It Better” shows a way to manufacture tires yourself. The approach combines 3D modeling, 3D printing, and silicone casting.
The first step is to create a 3D model of the desired tire. This geometry serves as the basis for a two-part negative mold. The mold reproduces the outer contour and tread pattern, while the actual component is created later in the cavity. Build It Better provides several suitable mold designs online. The negative mold can then be printed on a 3D printer and consists of two halves that are joined together during casting.
Silicone rubber is used for the actual tire. The material is poured into the prepared mold. This is followed by degassing to remove trapped air. This is crucial to ensure that the tread and edges form cleanly and that no cavities remain in the finished part. The silicone must then cure. The waiting time depends on the material used and how it is processed, but this is not specified in the description.
After curing, the tire is removed from the mold. Some reworking is then required: excess material at parting lines or sprues can be removed by trimming. The tire is then ready for use.
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