Original Prusa i3 MK2S is a successor to Original Prusa i3 MK2 with small hardware tweaks for easier assembly and improved reliability.

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Length of PTFE tube included in kit.

What's the correct length of the PTFE tubing that comes with the E3d hot end? The one my kit came with seems a little short and doesn't seem long enough to go all the way into the extruder carriage. I've attached a picture of my measurement.

Block Image

Yes, the tube in the picture is from the E3d in the kit. 50 mm would be a much better fit.

Block Image

Here is a closer picture. The gap between the hot end and the heater block seems to be a little over 5 mm. The hot end was heated up for the initial printer self-test only.

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Yes, the tube in the picture is from the E3d in the kit. 50 mm would be a much better fit.

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In the second picture, there are threads visible just below the heatsink. This isn't ok.

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Solution: Check there are no visible threads on the heatbreak between the heatsink and the heater block. Otherwise, the PTFE tube will get deformed after the whole hotend is heated up.

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No visible threads from the heatbreak to the heater block or from the heatbreak to the heatsink or both? This would take a considerable amount of force to eliminate the threads. I hand tightened only, I assumed the hotend was fully pre assembled and ready to go. You may want to add a note to the assembly instructions, this may happen to other users.

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Hi Krutik, from both. The gap is just a few mm on correctly assembled hotend. Your assumption regarding preassembly is correct and we will take measures, to prevent this happening again, I already discussed this with our production manager.

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Hi Krutik,

ideal length of the PTFE tube for MK2S is 50 mm. Did you take this tube out from the E3D hotend in our kit?

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Yes, the tube in the picture is from the E3d in the kit. 50 mm would be a much better fit.

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Hi Krutik, to further analyze what happened. Can you please tell me whether you heated up the printer and also take a picture of the hotend? I'm mainly interested in the gap between heatsink (rounded part) and heater block (square part). Thanks

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Added an additional picture to the original question. The gap between the hot end and the heater block seems to be a little over 5 mm. The hot end was heated up for the initial printer self-test only.

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Hi Krutik, just talked to colleagues from support and they will contact you.

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And the rest was? You left this dangling, how much gap is there supposed to be?

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Hi Dave, the gap between heatsink a heated block should be just a few millimetres and no visible threads. Does this answer you question?

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Krutik Bhakta will be eternally grateful.
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