About this 3D model

Hi , I have searched a lot for a fan duct for Budaschnozzle with Gregs Wade Extruder but I have not found one that I liked, so I designed one. Based on these: http://www.thingiverse.com/thing:257667 Use with 50mm fan. I made it in PLA but next I will do in ABS . I coated the part near the hot zone with Kapton tape to prevent overheating and warping.