NO MORE jamming to print TPU
This is a mod to fix jamming issue on Anycubic Kossel with TPU filament. If anyone try print TPU will know what I am talking about. This may also work on some other Delta type printer with some remake on my model.
Assemble is easy, just look at the picture and you will know.
Cut a 1 inch long Teflon tube, insert and trim into triangle shape as picture show, Assemble back everything, and should be all good to go! This mod still can print all 1.75 filaments.

The PC4-M6 tube fitting hole maybe too thigh, but is still ok to screw it in. I can make the hole bigger if there is request :p

So far, I have test print over 50+ hours without jam. so I think the jamming issue is completely fixed.
My TPU print setting on S3D is below

Nozzle diameter - 0.6
Extrusion Mulitiplier - 1.00
Extrusion width - 0.45
Reaction - on with default
Layer height - 0.2
Printing speed - 40 mm/s
Outline underspeed - 40%
Solid Infill underspeed - 40%
Outline overlap - 25%

I still working on different setting, please share with me if you have better setting!

Credit for the original guy who make the mod for the CR-10 to print TPU, I pickup the idea to make it for the kossel printer.