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Sienci LongMill & AltMill Dust Boot — 80mm Spindle | Magnetic Quick-Release CNC Dust Shoe
Sienci LongMill & AltMill Dust Boot — 80mm Spindle | Magnetic Quick-Release CNC Dust Shoe
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You upgraded to a spindle. Now your dust collection needs to catch up.
Sienci builds excellent machines, but once you swap the stock Makita for an 80mm spindle, the dust boot that came with your setup no longer fits. Most makers end up zip-tying a generic boot to the spindle body and hoping it holds. This one is a proper 80mm fit, built for the way LongMill and AltMill machines are actually put together.
- 🎯 True 80mm screw-clamp fit — clamps directly to the spindle body. No shims, no zip ties, no slipping halfway through a long job
- 🧲 Magnetic brush + anti-dislodge tabs — the skirt holds through aggressive passes but pops off in about two seconds when you need to see the bit
- 🔀 Full or split brush — the split skirt flips open for a tool change without unclamping the boot. Pick your style below
- ✂️ USA-made 3" nylon brush — trim it to length with scissors to match your tooling; replacements sold separately
- 🔌 Quick-connect hose port — 4" standard, with adapters from 1.25" to 4" included at no extra cost. Just tell us your hose size at checkout
- 🎨 Black by default — message us if you want a different color
🔧 Does This Fit My Sienci?
| Machine | Spindle | Fits? |
|---|---|---|
| LongMill MK2 / MK2.5 | 80mm spindle upgrade | ✅ Yes — this boot |
| AltMill / AltMill MK2 | 80mm spindle | ✅ Yes — this boot |
| LongMill MK2 / MK2.5 | Stock Makita RT0701 router | ❌ No — you need the 65mm v4 boot |
Quick check: measure the outer diameter of the motor body — not the collet, not the collet nut. Wrap a string around the widest part of the housing and divide the circumference by 3.14159. Around 80mm means this boot. Around 65mm means you're still on the Makita.
💡 Still not sure? Send us a photo of your spindle and Z-axis. We'd rather spend 30 seconds confirming than have you waiting on a return.
Hose size options: 4" · 2.5" OD · 2.25" OD · 1.75" OD · 1.5" ID · 1.25" ID
Made by CNC makers, for CNC makers — in small batches, in Lafayette, Indiana.
🛒 Complete Your Sienci Setup
What LongMill and AltMill owners usually grab alongside the boot:
| Product | Why You Need It | Price |
|---|---|---|
| Replacement Brush — Full & Split | The same brush that ships with your boot. Trim a skirt too short once and you'll be glad there's a spare on the shelf. | $24.99 |
| Dust Boot Brush by the Foot | USA-made nylon bristle, 0.5mm standard or 0.25mm fine. Cut to any length for a custom skirt height. | from $10.00 |
| Brush Spacers — ½" & 1" | Surfacing the AltMill's big spoilboard or running long end mills? Spacers drop the skirt for a better seal on deep cuts. | $22.99 |
| Hose Adapters — 1.25" to 4" | Quick-connect adapters for every common shop vac and dust collector hose size. | from $7.00 |
| Dust Hose Support Kit | Overhead EMT mount keeps a 4" hose off the spoilboard and out of the cut on every pass. | $46.50 |
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