I use a deburring tool to remove my brims.
just for info. For tidying that hole up. A cheap deburr tool will do that near perfect. I have found for any 'inner' holes the deburr tool is awesome at cleaning up plastics. much better than a dremel or file if you are careful Silverline 248844 Deburring Tool,145 mm: Amazon.co.uk: DIY & Tools
Get a deburring tool.
Using the most valuable and useful tool for 3d printing: a deburring tool. Silverline 248844 Handentgrater 145 mm https://www.amazon.de/dp/B00NVPMV5I/