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If you find this model useful, feel free to buy me a coffee. 

You can also download my dragon egg version of this. 
 

I needed a hollow, two-part, high-resolution Easter Egg with threads, so I made one!
 

The whole egg measures 63mm tall by 45mm wide.
 

Instructions:

1. Print the bottom and top pieces as oriented in the files. Supports are not required. I recommend a layer height of 0.2mm or smaller, wall thickness of 1.2mm, a bottom thickness of 0.6mm, and a top thickness of 0.8mm. Infill density of 12 percent or higher. I tried to allow for horizontal expansion in the design, so first try printing it without adjusting horizontal expansion, slicing tolerance, or x/y compensation. If it prints too tight or too loose, then you can use one of those slicing features to compensate. Threads are notorious for being the hardest item to print, so please be patient. If you want to save time while testing, you can print the included calibration test instead of the full model.

2. Once printed, screw the threads in and out repeatedly to remove any stray particles. It may feel too tight on the first threading but should screw easily after ten seconds of doing this.
 

I am also including the original Sketchup files. Feel free to remix this with surface skins and whatever you can dream up! Just don't forget to list your print as a remix of this.
 

Happy Easter!