Use 'cobble together' when something is done quickly, often because it's urgently needed.

Urgency Implied

The result of cobbling together is usually imperfect or temporary.

Makeshift Quality

'Cobble together' conveys a sense of creativity or resourcefulness in a pinch.

Use 'cobble together' for solutions that are temporary until a better one is available.

'Cobble together' often indicates a lack of prior planning.

Implies that multiple people or parties contribute to the end result.