There are about 4 things you can do to fix this. Brim is only one of them but you will probably have to do all 4. Your part is unusually difficult being a solid block but it can definitely be done! Don't give up. It's complicated so I made a video to explain in detail why the problem happens, quick summary of what to do and then detailed video of what to do. Yes it's kind of a long video but it's packed with crucial info much of which you will need:
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Carbon 28
Try printing with a "Brim"
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