Diagnosis
The warmth you feel is a warning sign. The Nutribullet Personal Blender's cup is designed as a sealed system. Blending hot liquids like soup or coffee creates two major hazards. First, the friction from the high-speed blades adds significant heat, potentially bringing liquids to a boil. Second, and more critically, this heat creates steam and rapid thermal expansion, which pressurizes the sealed container far beyond its intended limits, risking a violent explosion that can send hot liquid and plastic shrapnel flying.
How to Fix It
To blend soups or hot beverages safely, follow these steps:
- Let cooked ingredients cool to at least a warm (not hot) temperature, ideally below 140°F, before transferring to the cup.
- Never fill the cup to the max line with warm ingredients; leave extra headspace.
- Remove the center piece of the lid (the "vented cap") to prevent pressure buildup, or use the included flip-top lid without sealing it shut during blending.
- Blend in short pulses and hold the cup securely.
- For silky smooth hot soups, it's safest to blend in a traditional, vented countertop blender, then transfer to the Nutribullet cup for serving.
If That Didn't Work
If your cup is already warm and sealed from attempting to blend something hot, do not open it immediately. Carefully move the entire unit to a safe area, like a sink. Let it sit undisturbed until it cools completely to room temperature—this may take 30 minutes or more. Only then, while pointing the lid away from your face and body, slowly and carefully twist it open.
Heads Up
The same pressure principle applies to carbonated drinks or anything fermenting. Always err on the side of cooling ingredients first and avoiding a fully sealed blend to prevent injury and damage to your blender.