Lin Black Bulky Bobbin

This is a Lin Black Bulky Bobbin for spinning wheels in an easily printable, modular format.

The front end is a single piece and has a small insert for the bobbin core. The insert is slightly larger than the core, but even so it can be tricky to get in the first time.
The back end is in three pieces: the main part, whorl1 and whorl2. There is a small recess in whorl2 so that the two pieces fit well together. Both whorl pieces fit onto the "nose" of the back end -- the order doesn't matter.

When printing the pieces with a recess (front end, back end main, and whorl2) you'll want basic supports for the overhang. For whorl2 you could also print it upside down.

I printed on an Anet A8 with 0.4mm nozzle at 0.2mm/layer and 15% infill.

I found that the pieces fit together snugly enough that glue was not needed. But I will probably glue the core and the main end pieces just to be safe.