Hey Wayne,
generally there are different possibilities for the attachment of a dust boot.
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Either you use one that is attached to the Z assembly/X gantry, which is the case with the Onefinity Suckit Dust Boot, the PwnCNC Dust Boots v2, v3, v4, the new v9, the PwnCNC v8 (exclusively available as part of the Onefinity Infinite Dust Collection Kit (Includes Suck It Pro and PwnCNC v8 dust boot kits)), and @adamfenn28’s Big Suck dust boot (see also Big Suck comparison test) do. When using such a dust boot, you adjust its position to your workpiece height once before starting program. But it is also possible to
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use a dust boot that attaches to the router/spindle like the PwnCNC v7 or the v10 (the new version for the beefier Z-20 Z assembly), or the Nighthawk from SolaFide Design (Nick and Lindy). These dust boots will go up and down with your milling motor.
Such a dust boot would also allow for dust hoses of up to 100 mm diameter (US/imperial: 4 inch)
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And finally some people managed to implement a dust boot that is controlled independently from the milling motor, e.g. here and here.
If you use the Onefinity Suckit Dust Boot or the other dust boots mentioned above that do not go up and down with the milling motor, you will notice
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as they do not move out of the way when the milling motor moves downwards, you will break the acrylic Dust Boot Shields frequently and in this case, it is good to make your own shields and, as @AndyP already mentioned, not to use acrylic but polycarbonate/TPU instead, as recommended and described here or to buy here and here.
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When making your own, you could design one with the opening you need, e.g. one with room for the Makita hand trim router’s shaft lock as shown here.
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As @AndyP already mentioned, if you switch from the stock 65 mm milling motor mount to the optional 80 mm spindle mount, then the spindle’s shaft center (and subsequently the machine’s entire cutting area) will be located approx. 19/32″ / 15.1 mm more towards front. Either you take this into account when designing your own polycarbonate dust boot shields, or you modify your Dust Boot Arms so that the Dust Boot can be fixed in a position further forward, like shown here, here, here (with opening at the end), here (with opening at the end), here (with video showing quick-lock cam release for height adjustment (must see!)) and here.