The heptagon coaster AKA 'Hepster'

Ok, Ok. So your number is seven? Then this is your coaster, It has seven edges, seven heptagons inside, and seven smaller heptagons more in the center. So its a 7-7-7-7 coaster. I finish here my series of coasters for the time being, I have printed enough of them. This one works good avoiding the sucker effect on your glass like his brothers: Perfster and Ballster. All of them 80mm diameter. I was going to do a pentagon coaster but it sounded to me too familiar so I opted for the next number ava