Introduction
Use this guide to easily remove or replace the plastic bottom cover on your Mac mini.
Tools
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            Lift and remove the bottom cover. 
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            Align it carefully so that the words "Mac mini" can be read when the ports are facing you. 
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            Then, press down on the cover to snap its three hidden clips into place. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
2 comments
Where can i find the cover itself for MM 2018?
avxkim -
Check eBay for unibody Mac mini bottom covers. You can also 3D print one if you want to.
I got as far as this step to do one thing, blow out all the dust. It was far enough and a lot of dust came out. I used a XPower A-2S to blow out the dust.
nirv -