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How to compare two order CSV exports by order ID and line number
When an order has several items, its order ID appears on several rows. To compare two exports, match each row on both order ID and line number. This still works if the rows were sorted differently. For example, order 001, line 2 goes from quantity 4...
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How to price a small 3D print batch
Start with the number of whole build plates, even if the last one has spare capacity. An order of 25 parts at eight per plate takes four successful plates. To estimate retries, divide those four plates by the success rate. At a 10% complete-plate fa...
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How to build a 21-on/21-off rotation calendar
A 21-on/21-off work rotation repeats every 42 days. Treat your first workday as day one. The first work block ends 20 days after that date, and your first day off starts 21 days after it. For example, if you start on January 4, 2027, the first work ...
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