The links below are not specific to the MP Mini Delta.
3D printers in general will require similar maintenance procedures.

Maintaining Your 3D Printer - LulzBot
https://www.lulzbot.com/maintaining-your-3d-printer

How to get better results from your 3D printer - Maintenance - MakerBot
https://www.makerbot.com/media-center/2011/01/27/how-to-get-better-results-from-your-3d-printer

The 5 Best Ways to Maintain Your 3D Printer - Pinshape
https://pinshape.com/blog/3d-printer-maintenance/

Maintaining your printer - Ultimaker
https://ultimaker.com/en/resources/21925-maintaining-your-printer