$38.99 CAD
Clamp-groove shroud for the Antminer S19 and standard S21: the 6-inch collar carries a reinforced seat so a worm-drive band clamp cannot walk off under load. Built for vertical runs. One-piece PETG, made to order in Montreal, Quebec.
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This clamp-groove shroud gives a worm-drive duct clamp a dedicated seat on the 6-inch collar of the Antminer S19 and S21 dual 120 mm body, so the joint holds by geometry rather than by friction alone. On a plain barrel, a band clamp is only as good as how hard you dared tighten it. Give it a groove to sit in and it cannot walk toward the end of the collar, whatever the duct does.
Ducting fails at its joints, and it fails there because somebody tugged the flexible line while moving a machine, or because a vertical run spent three months hanging its own weight on a smooth plastic barrel. This is the version for installs where that is a realistic Tuesday.
Intake is the rear 120 mm fan pair on the Antminer S19, S19 Pro, S19j, S19j Pro, S19k Pro, S19 XP and the standard S21, on stock fan screws. The outlet is a 6-inch collar carrying a circumferential groove sized for an ordinary worm-drive duct clamp from any hardware store: nothing proprietary, nothing to order specially.
If your duct is short, horizontal, and nobody will move the machine with the line attached, the plain Antminer S19 / S21 Dual 120 mm to 6" Duct Shroud holds it well and costs less. The S21 Pro, S21+ and S21 XP sit on a 140 mm pair instead and take the Antminer S21 Pro Dual 140 mm to 6" Duct Shroud. The same grooved collar on a broader base is the Antminer S19 / S21 Dual 120 mm to 6-Inch Clamp-Groove Shroud — Wide Base.
A band clamp on a smooth barrel is a friction joint: it holds because the clamp squeezes the duct against the collar hard enough that neither slides. Pull on it and the whole assembly can creep toward the open end, a little at a time, until one day the duct is off. A groove makes it a mechanical joint instead, because the clamp has to climb out of its seat to move at all. Cutting a groove also thins a wall, which is exactly where a printed part would be tempted to fail, so this body puts the material back: the groove runs inside a reinforcing band and the collar keeps its section where the clamp squeezes hardest.
| Fits | Antminer S19 series and standard Antminer S21 — rear 120 mm fan pair |
|---|---|
| Intake | 2 × 120 mm fans |
| Outlet | 6″ collar with band-clamp groove |
| Mount style | Clamp groove — circumferential seat with reinforcing band |
| Clamp | Standard worm-drive duct clamp sized for 6″ duct |
| Footprint | 250 × 170 × 151.6 mm |
| Material | PETG |
| Colour | Black or orange PETG |
| Construction | Single continuous body — no assembly, no fasteners, no glued joints |
| Design files | Open source, CC BY-SA 4.0 — free to download, modify and redistribute |
| Download | STL, licence and installation guide (ZIP) — listed on the model card |
| SKU | DC-SHR-CLG-D120-6 |
Everything D-Central draws for this line is published, this collar included. It goes out open source under CC BY-SA 4.0 at the 3D models download center: download it, print it, widen the groove for the clamps you already own, sell what you make. A sealing detail that works is worth more shared than hoarded.
The groove profile came off D-Central Technologies’ own bench and goes out with everything else. Pull it from this model’s card, or take the ZIP directly: the STL, the CC BY-SA 4.0 licence, and the guide to installing and running it safely.
The listing itself is for the finished shroud, made to order in black or orange PETG and shipped from Montreal, Quebec. The drawing is free, the part is made properly, and orders — or D-Central’s fund page — pay for the next revision.
Compare all five mount styles side by side in the D-Central shroud and ducting system.
An ordinary worm-drive duct clamp sized for 6-inch duct, the kind sold in every hardware store next to the flexible ducting. The groove is cut for that standard band width. Nothing proprietary is involved, and if you already have a clamp on the machine, it will seat.
It would, which is why the groove sits inside a raised reinforcing band rather than being carved out of a plain wall. The material removed for the seat is added back around it, so the collar keeps its section exactly where the clamp squeezes hardest. The joint gains a stop without the barrel losing strength.
Both jobs come from the same tightened band: the clamp pulls the duct wall onto the collar all the way round, and the groove keeps that pressure where you put it instead of letting the band creep. Leaks in duct runs almost always start as a joint that has slipped, so a clamp that stays seated is the practical answer.
Choose the groove for vertical runs, heavy insulated duct, and machines carried while still connected. Choose the plain collar for a short horizontal line installed once and left alone. Both take the same fans, the same duct and the same clamp; only the seat under the clamp changes.
Flexible duct is where the groove shines, because the band pulls the soft wall into the seat. Rigid 6-inch pipe slides over the collar and clamps the same way, or joins with the 6" duct coupler. For a mixed run, the 6-inch flex duct adapter handles the changeover.
| Weight | 348 g |
|---|---|
| Dimensions | 25 × 15.16 × 17 cm |
| Colour | Black, Orange |
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