Spare cap for older PET bottles (PCO-1810)
A replacement cap for the taller thread on older and some imported bottles. The thread matches the PCO-1810 standard, so it screws onto store bottles; Print it in PETG so it flexes onto the neck instead of cracking, and add 0.1 mm of clearance if your brand runs tight.

2D preview
Customize (configurator with these values)
Files are generated on request from the live generator; free, no account.
Specifications
| Neck | PCO-1810 (24.94 mm, 3.18 mm pitch) |
|---|---|
| Style | plain screw cap |
| Grip | knurled |
| Seal | none (dry seal on the neck lip) |
| Clearance | 0.5 mm, adjustable |
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
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- Two-bottle PET coupler (PCO-1881)
- Spare cap for PET bottles (PCO-1881)
- PET bottle cap with hanging loop (PCO-1881)
- PET bottle coupler (PCO-1881)
- 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