http://www.thingiverse.com/thing:67948 mdietz
http://www.thingiverse.com/thing:737699 goligo
Based on their design, I added a few collars for perpendicular spring support and a rod reciever collar to the egg holding part. Made the thin part of the base a little less fragile by elevating it.
2015_03_30_Eggholder_Cap.STL | 344.8KB | |
2015_03_30_Eggholder_Rod.STL | 123.8KB | |
2015_03_30_Egholder_Frame.STL | 294.5KB |