About this 3D model
Use super krazy plastic glue to join parts. Because I didn't want to use Supports. Final size 40mmx40mmx35mm Update (Mar 16, 2019): Added two files, mushroom-cap, and mushroom-stem. It seems that some slicers are showing the stem on mushroom-split in the air. If you load stem and cap separately you can "land" or adjust the z position to make it printable.