Handheld Egg Opening Tool

This week, my class had a science fair. We were allowed to invent anything that would solve a problem. I always struggle to crack an egg without some shell falling in, so I decided to make an egg opening tool.

This was my plan: There would be a place for the egg to sit, and then a system of levers will force a sharp point into it, cracking it open.

You will need:

-Tinkercad, or another 3D printing software. (Which means you also need a 3D printer.)

-Screws and bolts, so that each part can move.

-An egg, to test it.

Note: I used the "scribble" feature on Tinkercad to make pretty much every part of it.

Here is what I made first:

-The handles for the tool - 100mm long, 16mm wide, 3mm tall. (Which you will hold on to and move, like the handles of scissors.)

-Some small cylinders and circles. (Please ignore these, I was going to glue them together in place of screws and bolts but it didn't work out.)

Here is what I made next:

-A tall back that the egg will lean against - 13mm high

-Two circles that the handles will connect to - 13mm diameter

(The whole egg holder is 83mm long and 43mm wide.)

This claw-like bottom is what the egg will sit on. Its inside dimensions are about 40mm long and 20mm wide. It is 2mm tall.

Here is what I added last:

-A wedge to crack the egg - 50mm long, 14mm wide, 10mm tall.

-Two connecting pieces to move the wedge - 45mm long, 14mm wide, 3mm tall.

Then, I put them together to see if all of the dimensions were right, and printed it out!

Only two things went wrong with this:

-My original screw substitute idea failed, but I managed to find some real screws that fit.

-The wedge piece was too long, so I drilled a hole in the middle to place it farther away from the egg.

Then, after that, it worked great! I tested it twice, and it broke the yolk, but no shell fell in. That means it completed my goal!

I hope you enjoyed my very first Instructable, have a good summer!