openscad　(コップ)

https://scrapbox.io/files/65dc3dd23b889e0024a72fc8.png

https://scrapbox.io/files/65dc3e1d7da38600255a404c.png

https://scrapbox.io/files/65dc3e3ed3c584002753daf0.png

コマンド

r=25;

difference() {

cylinder(h=r,d=30);

cylinder(h=r, d=r);

}