Double Thread Spool for Cordless Lawn Trimmer

This is my first publication so bear with me if I missed/messed up something.

The design is the result of reverse engineering a spool found in a cordless lawn trimmer.
Since I don't know whether or not I am allowed to state any brand names here, I'd rather just say the cordless tool this spool is compatible with was bought at one of the two German 4 letter word store chains starting with the letter "L". ;)
The tool is great, and what I love most about it is the thread auto release functionality this spool is a part of. Hats off to the original designer!

To help the 3D printing community I have split the design into 4 separate parts so they can be printed without any supports. Sequential printing all parts is advised. 
Once printed, assembly itself is pretty straightforward, begin with part A and finish with part D. The parts should be assembled and glued together, tiny drops of CA work well for this purpose.

The original spool takes 2 x 3 m thread, Ø 1.4 mm, but for testing purposes I have wound one spool with Ø1.75 mm PETG filament.
I guess PETG won't work well as it isn't flexible enough. Trial will tell.

Hope you'll like this and that it will let you make your own re-fill spools, try different diameter, shape and material threads with your awesome lawn trimmer.

Slicer setting I have used:
0.2mm layer height
2.5 wall thickness (ideamaker)
30% infill

If you like the design please show it by clicking the like ♥ button. Thank you!

Happy 3D printing!
Happy Gardening!