This is a Zbrush Ztool that I've specially set up to be super easy to sculpt tiling textures in conjunction with the WrapMode setting. It has a subtool to help frame your tile perfectly on the canvas when you press F, and uses a texture that you can set to mask out the range beyond the tile. You can adjust the texture masking under Texture Map > Transparency. Alternatively you can just turn the texture off.
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