Tested:

• on Ultimaker 2 Go.
• with PLA filament,
• on Cura slicer,
• layer height 0,15 mm (exept Duo_pupils.stl - 0,10 mm),
• infill 20%,
• scale 300 %. I recommend to print smaller parts like pupils and legs in sets of 5 so that the heat of the nozzle wont melt little elements. Concider printing them in 0.1 resolution as well.

Print Settings

Printer Brand: Ultimaker

Pinter:  Ultimaker 2 Go

Rafts: Doesn't Matter

Supports:  Yes

Resolution: 0.15 mm

Infill:  20 %

Filament: Orbi-Tech PLA green, white, orange, black 

Notes: 

Personally, after uploading STL's to Cura I scaled all parts by 300 % so the model size is optimal for me.

I recommend to print smaller parts like pupils and legs in sets of 5 so that the heat of the nozzle wont melt little elements.

Post-Printing

I put an effort to be sure all parts fit so You should be able to assemble the model without glue, like LEGO :D . Have fun !!!

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 Duo 3D modeling and printing