All four wheel bolts are too short. This means that nuts with plastic inside will not reach the bolts when tightened. So they don't snap into place like they should. The seller ran out of the right length parts and replaced them with the wrong shorter screws. Others have complained about this and the problem has not been resolved. The biggest problem with this kit is the lack of detailed instructions. I was given a piece of paper with instructions but so much information was left out. I'm guessing the instructions only cover about 50% of what you need to know about creating this mod. The hardest part is finding the right length for the blue glow tube. I had to measure how deep the tube was inserted into the red body. I then had to measure the same at the end of the extruder. The tube caps are 2mm apart when these parts are installed. So I added 2mm to the length of the red heatsink tube and the length of the extruder tube. I messed up the connector on the end of the extruder so I had to order a replacement. Once they arrive I can finally put these pieces together and see how well the blue tubing fits in between. My size turned out to be 62 mm. DISCLAIMER: The style of your end caps may vary in length for your machine as there are different designs. So measure each side and add a gap. If you blindly run 62mm, it may be too short and your filament will seep through and fill the entire chamber. It will be almost impossible to clean. This happened to me and I had to replace all parts with new ones.
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