I happened to come across this one randomly while prototyping something different. I thought this was already cool enough to publish.

You need:
1 Heart
14 Connectors
6 Square Pieces
8 Triangle Pieces
The tool is optional.
I did include an "All" File. You can find all the parts you need on there.

Print Settings:
Standard. No supports. You may need to use a brim.

Assembly:
I did make a Video how to Watch the video.
It's simple. First, push the connectors into the Heart. Then push the Square Gears that have a little Square on the bottom on the Square Faces of the Gear. Do the same for the Triangle Gears, but with the Triangle Pieces of the Heart.

Troubleshooting:
If your Gears are too loose or to tight watch this Video: https://youtu.be/PWUoJc_Gc84.

If your connectors break, try experimenting with how many walls you print. I usually print 2 walls, but try different amounts to see if it gets better.
You can also try to print them with another spool or even another Plastic. PETG works quite well.

Technical Data:
The Gear Blob takes, around 100g of Filament and 4,5 hours to print.

The Filament I used in the Pictures is:
Green Protopasta Seafoam Green.
Blue Protopasta Tidal Turquoise.