The Teflon tube outer diameter for these 3D printers is usually 3 or 4 mm. The inner diameter of these nozzles is only 2.5 mm. The description doesn't list the inside diameter but it says it will fit my printer. I had to drill through the inside to fit the PTFE tube. The rest of the brass nozzles are very well made. I don't know if my drill bits will hold up to steel, so I probably won't use them to see how well they flow.
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