Sans from Undertale
myminifactory
Found a few Sans models out there but they would not look good, took the free 3d model from here and retouched it a bit to be printer-friendly and also to make it look closer to the in-game character (IMHO).
Download Model from myminifactory
With this file you will be able to print Sans from Undertale 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 Sans from Undertale.