A practical set of 3D-printable sleeve adapters for connecting round vacuum, dust-extraction and workshop hose or pipe ends with different outside diameters.

This pack covers the measured OD sizes 32, 35, 38 and 40 mm.

Included ready-made adapters:

32–35 mm32–38 mm32–40 mm35–38 mm35–40 mm38–40 mm

The adapter slips OVER both mating parts. The size numbers refer to the actual OUTSIDE DIAMETER of the parts, not to a brand-specific or nominal hose standard.

Also included:

4 short fit-check rings for 32 / 35 / 38 / 40 mmEditable OpenSCAD sourceSize tableREADME with printing and fit instructions

Default geometry:

+0.4 mm diametral clearance2.4 mm wall thicknessStraight sleeve endsSmooth 10 mm transitionApproximately 1/3 diameter insertion length per sideUnits: millimeters

Printing:Designed for FDM printing upright on one circular end. A 0.4 mm nozzle and 0.20 mm layer height are a practical starting point. Supports are normally not required.

Physical validation:The CR20KB adapter workflow was tested on a real vacuum assembly. Two mating parts were measured at approximately 34.42 mm and 34.29 mm, an STL was generated, printed and successfully fit-tested on the actual assembly.

Important:Vacuum hose dimensions and printer tolerances vary. Measure the actual outside diameter with calipers and print the included fit-check ring before printing the full adapter.

These are generic measured-size adapters. No specific brand compatibility is claimed.