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This doesn't actually make hatch work any better, but it's a good failsafe to practice in case your area doesn't hatch correctly.
Draw a polygon around the area to be hatched, and delete it afterward. And turn off any layers you won't need during the hatching command. If you're one of those lazy users that always reuses the same file, and has ten different projects off to the side in model space, delete them and PURGE again. Before hatching, do whatever you need to do to cut down the amount of data going on in your drawing. Nevertheless, here are some tried-and-true "solutions":
An even bigger mystery is how to explain to your non-CAD coworkers why it took all afternoon to color a map. Among the mysteries of the universe is why a program that can build a scale 3-D model of the solar system cannot seamlessly perform some of the same functions that my Super Nintendo did in Mario Paint. Here is a video where I show how to import these patterns and even show how to create your own custom patterns.Can't get AutoCAD to hatch an area? As frequently as this happens, I could have just titled this article "Using Hatch in AutoCAD".
FREE DOWNLOAD ALERT: Click here to download 82 of the most popular AutoCAD hatch patterns. Plywood CAD hatch patterns, section view and plan view. The best quality and selection of AutoCAD wood and wood flooring hatch patterns available! There are 12 CAD hatch patterns that include the following patterns: Hardwood AutoCAD hatch pattern. Custom hatch patterns files will automatically be copied to the following locations: AutoCAD for Mac. Browse to the location of the custom.pat files, select them, and click Open. Click the drop-down arrow and select Add Patterns. Click the pull-down in the Hatch visor for Patterns and click Open Library. On any drawing, type the HATCH command. The ArchBlocks Hatch Patterns library for AutoCAD® gives you 376 hatch patterns for architectural, interior, geological, mechanical, and landscape designers.