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If you use ABS or MABS bricks, yes. If you use older PP bricks, I'd recommend against it.

Why? Loads of food containers are made of PP. Is it the age rather than the material that puts you off?

I assume not porousness, since by far the largest pores regardless of material will be the brick joints.

BPA-containing materials are not food-grade in EU.

PP is BPA-free and widely used in the EU.

PP does not contain BPA. You might be thinking of PC.

Ah sorry, you're indeed right. Some PET materials would also contain BPA.

Either way, I'd be careful.