I just installed a 2nd hotend in the EXT0 slot.

3D Printing
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1

I just installed a 2nd hotend in the EXT0 slot. It should have the same thermistor as my old one and it has the same heater cartridge as well. I copied over the settings from EXT0 to EXT1. My old hotend moved from EXT0 to EXT1. The only difference between the two hotends is the nozzle. The newer extruder has a newer model nozzle. I am using Repetier Host on a Rostock Max. Sadly, the hotends are pretty much touching eachother due to the cramped hotend spacer. If I set Any temperature for EXT1, the temperature keeps climbing in reading. If the temperature was really as high as it read though, the hotend would already be a puddle of ptfe and pet ontop of aluminum. It said 265C at one time. I am thinking I have the thermistor selection set right. At any rate, it is the same selection for both thermistors. Does anyone have a clue what on earth is causing my printer to read obscene temperatures for EXT1 (the old hotend in the new slot)?

2

So, you’ve set the t01 thermistor selection value to the same as t00 in configuration.h?

3

Yeah. It calls them ext0 and ext1 though. Both are set to 97 which is general table 1. Maybe you can’t choose general table 1 for both? I really wish I knew the exact name of this thermistor. I can’t even be sure I chose the right entry.

4

So it’s not a glass bead 100k thermistor? Might be worth switching to marlin. I found repeteir to unreliable. Saying that, I don’t have a Delta though.

5

Hey mate, also check that heat_1 isn’t still set as the hotend cooling fan! Remember, it was used in single hotend machines as the peek cooler fan so anytime the first hotend was set on it would power that fan at 100%

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I do believe I skipped over the 2 slots for the cooling fan when you look at the top of the board. I will definitely check out the thread. Thanks for replying, John and Loren.

Tim, I have wondered about Repetier Host before too. I don’t know if it is electrical damage or what, but this thing keeps saying it is busy from time to time resulting in me needing to toggle the power and lose precious printing time. It seems the printers with cartesian based math are alot more hackable too.