Two-bottle PET coupler (PCO-1881)
Screw a bottle on each end and you have a sealed hourglass or the world's cheapest storage tube. Both sockets carry the same right-hand thread - chirality survives flipping, so it just works.
2D preview
⬇ Download STL + 3MF (zip)
Customize (configurator with these values)
Files are generated on request from the live generator; free, no account.
Specifications
| Fits | two PCO-1881 necks, one at each end |
|---|---|
| Use | storage tubes, hourglasses, bean silos |
| as exported, no supports |
Printing
- Prints top-down as exported, threads up: no supports.
- PETG over PLA: it flexes onto the neck instead of cracking; 0.16 mm layers smooth the fine pitch.
- Too tight: regenerate with +0.1 mm clearance, necks vary by brand.
More pet bottle caps
- Spare PET bottle cap (PCO-1881)
- Spare cap for PET bottles (PCO-1881)
- PET bottle cap with hanging loop (PCO-1881)
- PET bottle coupler (PCO-1881)
- Spare cap for older PET bottles (PCO-1810)
- PET bottle cap with loop (PCO-1810)
- 38 mm juice and milk bottle cap
- 38 mm bottle cap with hanging loop
- All pet bottle caps · set your own dimensions in the PET Cap Generator