This upgrade kit further improves the CrazyDevy parts used for your G1 Predator King Combiner. Tested & recommended material is WSF polished, though people have had success printing in black strong flexible so you can give that a try if you do not feel like painting anything.
For more details and instructions, please visit my TFW2005 thread HERE
Please handle parts with care, and sand where needed. Clean the parts thoroughly from residue powder before trying to fit the parts onto the toy. Handle slowly and with care when connecting and removing parts from toys to avoid damage, as I cannot be held responsible for any kind of defects or damage that arise when using this upgrade. Please order at your own risk.