I just happened to see this post yesterday. Mine was broken and I replaced it last night and it fixed most of my problems. I would recommend sticking with PETG because the PLA might break when you are putting in the springs. You have to bend the part quite a bit. Thanks for posting this Bill.

Thanks for the response. As you know the MK3S only has one PTFE tube that goes from the extruder to the hotend. Since I already have a 1.8mm tube are you suggesting that I leave the bottom (closer to the heater) with 1.8mm and have a separate 2mm ID tube closer to the extruder. I'm not sure how that would improve the situation. I included the following pictures. White tube is from the extruder right now and black is what came with the chameleon kit so they are essentially the same inner diameter. Hope this makes sense. Thanks as always for your help!