Printable tri-clamp (45°): carbonation stone caps: 1½ in, 4 to 16 in down tube — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/printable-tri-clamp-carb-stone-caps/ (CC BY 4.0) Basis: Xem Studio design: the standard 1½ in solid cap, a ¼ in hose barb outside, a Ø6.35 down tube and a socket for a ½ in (Ø12.7) diffusion stone; printable 45° back cone Catalog version: 2026-10-20 Sizes: see table below - 3D-printable tri-clamp: this is Xem Studio's print-friendly version of the standard sanitary fitting, drawn so it prints on an ordinary FDM or resin printer with no supports. Download the STL to print it, or the STEP to edit it. The files are true size (no printing allowance): add your own clearance in the slicer or CAD if your printer needs it. - Gas in through the barb, out through the stone at the bottom: carbonating or oxygenating wort in the vessel. - Left out because they are taller than a 256 mm printer: carb-stone-cap-1.5in-12in, carb-stone-cap-1.5in-16in (the standard page has them). - Printable tri-clamp: the ISO 2852 face and gasket groove are exactly standard, only the back cone behind each rim is 45° instead of 20°, so no rim overhangs more than 45° from vertical in any print orientation. Join these with the 45° clamps (printable-tri-clamp-clamps) and standard Type B gaskets; a 45° clamp fits only 45° rims, so keep a run all 45°. A 45° cone turns clamp force into face force at 1 : 1 (a 20° cone at 2.7 : 1), so tighten the clamp bolts harder or use M6. - Print orientation: straight parts face down; elbows, tees and crosses with one face down; horizontal bores bridge their top, so keep them small or add a light tree support inside. - Every clamp face is the ISO 2852 profile used across this site: 2.85 mm rim, flat face with the gasket groove (K 1.6 deep, R3 1.2 bottom, 23° walls, P2 0.8 edges) on C2, 20° back cone. Flange C3 / groove C2 / tube OD × wall, mm: ½–¾ in 25.0 / 20.4 (derived) / 12.7–19.05 × 1.65; 1–1½ in 50.5 / 43.5 / 25.4–38.1 × 1.65; 2 in 64.0 / 56.5 / 50.8 × 1.65; 2½ in 77.5 / 70.5 / 63.5 × 1.65; 3 in 91.0 / 83.5 / 76.2 × 1.65; 4 in 119.0 / 110.0 / 101.6 × 2.11; 6 in 166.9 (6.570 in) / 156.5 / 152.4 × 2.77; 8 in 217.7 (8.570 in) / 207.0 / 203.2 × 2.77; 10 in 268.5 / 261.0 / 254.0 × 3.40; 12 in 319.3 / 311.8 / 304.8 × 3.40. tube_in tube_mm stone 4 101.6 ½ in × 2 in stone 6 152.4 ½ in × 2 in stone 12 304.8 ½ in × 2 in stone 16 406.4 ½ in × 2 in stone Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - GW Kent: Tri-clamp fittings guide: tube OD, flange OD and ID per size to 12 in; solid cap thickness — web — publisher's guide; dimensions cited — https://www.gwkent.com/triclamp-guide - Rubber Fab: Tri-Clamp gasket dimensional chart: gasket ID, OD and bead diameter per size (2 in bead 2.22 in / 56.50 mm, 1.5 in 1.71 / 43.50, 3 in 3.29 / 83.50) — PDF — maker chart; dimensions are facts [verify license at link] — https://shop.andersonprocess.com/media/assets/product/documents/rubber-fab-tri-clamp-dimensions.pdf Free files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/printable-tri-clamp-carb-stone-caps/index.json API: https://xemstudio.com/api/geometry?object=printable-tri-clamp-carb-stone-caps