I've printed the "1 Meter Alien" and because the Feet's are not just simply flat they bacome a little bit weak. Therefore I've made some TPU Sandales for him/it. To connect Top and Bottom I've just use some Plastic Car Panel Connectors, but a Screw, a peace of String or even just Glue will work here as well :-D
https://makerworld.com/en/models/73476#profileId-77928