I figured that the bowden tube was being pulled over too much at the PTC connector and may have been causing feed jams when loading filament. Since fitting this device I have had no more jams at filament load.
Printed with standard white PLA.
The hole for the bowden tube is a little small so just needs opening out a bit after printing.
The wings will need support - set to very low level. I left the slicer on default supports and then had to spend half an hour trying to remove a solid mass of support from inside the model. This led to me breaking one of the wings. The burnt wing in the photo is where I welded the wing back together with a lighter!