Threaded cap designed to protect the spark plug hole during engine maintenance, transport, or storage.

Useful to:

• prevent dust and debris entry
• protect the thread during repair work
• temporarily seal the cylinder head opening

✅ Simple and durable design
✅ Hand-tight installation
✅ No supports required

Technical details:

• Thread: (e.g. M14x1.25 – check your engine!)
• FDM-friendly tolerances

⚠️ Note:
The most common spark plug thread size is M14x1.25, but M10 and M12 variants also exist depending on the engine. Always verify compatibility.

Included FreeCdd model so it can easily modified

Recommended materials:

• PETG → good balance
• ABS / ASA → heat resistant
• PLA → temporary use only

Assembly:

The model includes a 65mm and a 60mm version. The model has a through hole to optionally add a screw M6x65 (or 60 depending on the model) to increase the strenght of the part in case of hits. 

⚠️ Disclaimer Not intended for running engines
Do not use as a permanent mechanical part
Hand-tight only
Not pressure or heat rated