I am a fabricator.
There are often at least a few options for seam locations. Seam locations in homogeneous material (little or no movement) aren't important if the fabricator is skilled since such seams will be hard to spot unless looked for.
There are various opinions on seaming at a sink. We don't do it for the following reasons:
1. The sink would normally be the busiest place in the whole kitchen so why put a seam there. (note if the sink is a drop in then most of the seam would be covered by the flange on the sink and the rails remaining after a drop in cutout might be too thin to allow moving the part without seaming.)
2. The vacuum cup/ratcheting device used to make excellent seams cannot be used to seam the sink rails. This doesn't make it impossible to do a great seam at a sink but it definitely makes it more difficult.
3. Fabricators like seams at the sink because it mostly eliminates the risk of a cracked sink rail which can easily cost the fabricator a couple of thousand dollars. Good for the fabricator but not necessarily the best option for quality.
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Stools and countertops
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