The Sieg X2 Mini Mills like my Grizzly G8689 come with drill chucks. The Grizzly and some other brands also come with collets for holding end mills, while the Harbor Freight version comes only with a drill chuck, as far as I know. Today, I tried doing some milling using the chuck to hold an end mill, because I wanted the extra reach it provided.
Compared with a collet, the chuck is noticeably less rigid and watching the mill rotate, it also looks like it hold the end mill less concentrically. I.e., there's some noticeable wobble.
Based on this brief experience, collets are much better than the drill chuck for milling. End mill holders are another option, but I have no experience with them.
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