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PROTEL’s method for creating metal slots: It should be emphasized that the approach shown in Figure 3 is not advisable; this method leads to discrepancies. For instance, with the slot-shaped outline lines (pink lines), each different board outline line represents a separate layer, which results in the omission of some outline lines, leaving only one hole in the final product. It is recommended to use the approach shown in the figure below when designing long slots in Protel 99 SE, by creating individual holes via pads and stacking them to form a long slot. Although it takes some time to draw, the final result will be exactly what you want. Due to limitations of the software, please follow the standardized design shown in the image below. AD can directly draw slots as shown in the figure below: This software makes it convenient to design slots using the Slot function, as illustrated in the figure. It should be noted that Rect (should not be used for square-shaped slots); the slots created in this way cannot achieve a 90-degree right angle even in actual production. By default, oval-shaped holes and grooves are created (this is due to the manufacturing process; in the images, the square holes and grooves are formed using routers and drills. Routers and drills have their own diameter, such as 1.6 mm or 1.8 mm, so the corners of the square holes have 45-degree rounded edges with a diameter of 1.6 mm or 1.8 mm). Right angles are formed using circular tools, but the corners aren’t perfectly shaped; the formula for determining the size of these corners is: hole size * 0.2. https://www.sz-jlc.com/uploadfiles/image/20180807/1533625786866076147.png https://www.sz-jlc.com/uploadfiles/image/20180807/1533625821541036238.png