Printable tri-clamp (45°): reducers, concentric and eccentric: 6 × 3, 6 × 4, 8 × 4 and 8 × 6 in — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/printable-sanitary-clamp-reducers-6-8in/ (CC BY 4.0) Basis: Xem Studio design: the standard large fittings with 45° clamp rims 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. - Face-to-face per Dixon 31-14MP / 32-14MP (S&O and VNE list 6 × 3 and 6 × 4 within 0.13 in). No maker lists 10 × 8 or 12 × 10 with clamp ends. - 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. reducer face_to_face_in 6 × 3 in 6.88 6 × 4 in 7.0 8 × 4 in 7.5 8 × 6 in 7.75 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Dixon Sanitary: B31-14MP / B32-14MP clamp reducers (2023 catalog p. 692–693) — PDF — Publisher's catalog; dimensions are facts — https://mexico.dixonvalve.com/sites/default/files/catalog/mexico_dixonvalve_com/2024_10/catalog%202023/DSC2023%20Page%20-%20692.pdf - Steel & O'Brien: Sanitary 2025 catalog (7MP tee and 9MP cross, p. 14–15) — PDF — Publisher's catalog; dimensions are facts — https://steelobrien.com/wp-content/uploads/2025/03/Sanitary-2025-FINAL.pdf - 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, 8 parts): https://xemstudio.com/files/hardware/printable-sanitary-clamp-reducers-6-8in/index.json API: https://xemstudio.com/api/geometry?object=printable-sanitary-clamp-reducers-6-8in