Knock Box with high sides to minimize coffee splatter in your kitchen. This design is specifically constructed with the post-crystallization of PLA+ in mind. That means that all the tolerances are designed so that after printing you can put the knock box and the bar into your oven and afterwards it will still fit. Post-crystallization will make it super strong and dishwasher-safe. I've been using it for 2 years now and it's still going strong.

No

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I actually used 100 % infill for the bar, but it's probably not necessary.

When it's done printing, put the box and the bar on a baking tray into the oven for 30 minutes at 65 °C.
Why? It will increase the impact resistance by a magnitude and also raise melting temperature so that you can put it in the dishwasher.