List of websites for 3D printer test models:
20mm calibration cube: https://www.youtube.com/redirect?q=http%3A%2F%2Fwww.thingiverse.com%2Fthing%3A953162&redir_token=FZfpCCDLuVO7XpcLraPD6HMvaP58MTU2NjAzMzE2OEAxNTY1OTQ2NzY4&v=BrvMqrgGXuE&event=video_description
Yoda Head: https://www.youtube.com/redirect?q=http%3A%2F%2Fwww.thingiverse.com%2Fthing%3A14104&redir_token=FZfpCCDLuVO7XpcLraPD6HMvaP58MTU2NjAzMzE2OEAxNTY1OTQ2NzY4&v=BrvMqrgGXuE&event=video_description
Torture Test: https://www.youtube.com/redirect?q=http%3A%2F%2Fwww.thingiverse.com%2Fthing%3A33902&redir_token=FZfpCCDLuVO7XpcLraPD6HMvaP58MTU2NjAzMzE2OEAxNTY1OTQ2NzY4&v=BrvMqrgGXuE&event=video_description
Boat: www.3dbenchy.com