thingiverse
This is the only model of Alien, that i found in the Sketchup gallery.http://sketchup.google.com/3dwarehouse/details?mid=d1552782213fc1cf76516d84319b2de7
Its a semi 2D model, in which I had to work hard, to repair all intersected faces.
Instructions
Print and glue.
Print the fourth part (tail) with support.
Direct link to the original creator's page
Click the "View on thingiverse" button above to visit the original model page on thingiverse. You can download the STL file directly from the creator's page for free.
This STL file is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
Yes, this model is available as a free download on thingiverse. Some creators accept tips or donations.
Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer. Check the license on the original thingiverse page to see if modifications are permitted by the creator.