turn everything into OttoDIY head
thingiverse
import OttoDIY-inverted_head_v08.stl and OttoDIY+_head_v08.stl into your Tinkercad. place the two models on each other. mark the model OttoDIY-inverted_head_v08.stl as a hole look in thingiverse for a nice face, download it, and import it into tinkercad. align the imported face to make the eyes fit for ultrasonic-sensor. Group all the things. export your customized otto head. have fun.
Download Model from thingiverse
With this file you will be able to print turn everything into OttoDIY head with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on turn everything into OttoDIY head.