Colour changes do add alot of waste, but there are some tactics to reduce that.
1. You can simplify models so colour changes are limited.
2. You can dump the waste into another model on the build plate where colour is less of a concern
3. filling the plate with models when doing multi colour prints spreads reduces the waste per model as it will switch colours optimized for the plate.
4. live with it and not stress about a couple of dollars of plastic. Filament goes a long way when printing little fidget toys and fun things for kids.
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