Kromski spinning wheel bobbins

In response to another bobbin, I was asked if I also had a bobbin for a Kromski spinning wheel.
I didn't have one yet, but I made one.

Since I don't have a Kromski spinning wheel myself, @Blacksmithman did the testing on a spinning wheel for me. Many thanks!

There are three types of Kromski bobbins:
A normal, a jumbo, and a great version.
The great version has larger discs and a longer tube than the normal version.
The jumbo version falls between these two. It has the larger discs but the normal-length tube.
The bobbin you need depends on the flyer you're using.
All files are included, so you can print the files you need.

During testing, I found that if I print the design myself with an 8.1mm axle hole, it runs smoothly on an 8mm axle with minimal drilling.

But with Blacksmithman, this hole was too small.

therefore I made a second tube with an 8.3mm axle hole, and that one fits.
So you have to decide for yourself which tube you need. Both versions are available.
 

It's important that the bobbin rotates smoothly on the axle, but too much play creates a rattling sound.

A slightly too-small axle hole, carefully drilled out, works best for me.

I always print the bobbin discs myself with silk-PLA, and the tube with PETG. But almost any filament will work.

Happy spinning!