What does the optimiser actually do?
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You list your stock and your parts. It packs the parts onto as few pieces of stock as it can, leaves a saw kerf between every cut, and draws the layout sheet by sheet.
Does it handle sheet goods and long boards?
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Both, as two separate modes. Sheet goods packs in two directions across a panel. Linear lumber packs along the length of a board, which is how a 2x4 gets cut.
Can I type fractions?
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Yes. Enter 23-1/2 or 3/4 and it reads them properly. Switch the whole app to millimetres in settings if you work metric.
Does it respect grain direction?
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In sheet mode each part can be set to run with the long side, the short side, or either. Parts that could not be placed the way you asked are called out on the result.
What is the kerf setting for?
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The width your blade removes on every cut, 3.2 mm or about 1/8 in by default. It is subtracted between pieces, so the layout is one you can actually cut.
Is it free?
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Everything is open for fourteen days. After that three saved projects and the calculators stay free, and $4.99 once removes the ads, lifts the project limit and prints the full cut plan without a watermark.
Does it need an account or a connection?
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Neither. Projects, cut plans and calculations live on the phone. Nothing is uploaded and there is nothing to sign into.