V2 thermistor
Posted: Mon Jun 24, 2024 2:39 pm
Has anyone figured out a durable way to attach the (original) hot end thermistor that doesn't create a stress point that breaks the wire?
My original solder lasted 22 hours (this seems very small... I suspect my odometer got reset) or 1 year, but after pulling it out of storage it only lasted a couple prints before breaking. I'm on my 4th attempt at soldering that tiny wire flapping around behind the heater wires and I keep getting cold joints that last a couple prints.
Given the tiny wires on the thermistor, this seems like an unavoidable repair. I admittedly chose a connector with wires that are much too large, but I don't think it matters how well you secure the wires - there's a lot of energy jiggling this thing and it's all going to end up fatiguing the solder joint of that tiny wire!
My first plan is to print a little post to screw in next to the notch where you zip tie the wires so I can add more zip ties so the whip doesn't cause as much stress.
I'm also wondering if there is a way to secure the tiny wire next to the hot end.
a) place splint (that can take the heat) along wires/solder joint? I worry this may shift the stress and cause the thermistor end the break... then I'm doing a much more extensive repair.
b) use some sort of heat immune, thermally neutral, magic epoxy to encase the entire wire? I have no idea what epoxy though.
c) Is this hopeless? Is a major overhaul is inevitable? there's a youtuber (DooDad) who tapped the thermistor hole and bought a threaded one, eliminating the need for thermal glue. Worst case, even if this also breaks, it sounds much easier to repair. BUT this is a time consuming project with a non-zero dollar cost; when I have more money I'll just do the full V3.2 upgrade... so in the short term, are there thermistors with thicker wiring that I could expect to last several hundred hours?
My original solder lasted 22 hours (this seems very small... I suspect my odometer got reset) or 1 year, but after pulling it out of storage it only lasted a couple prints before breaking. I'm on my 4th attempt at soldering that tiny wire flapping around behind the heater wires and I keep getting cold joints that last a couple prints.
Given the tiny wires on the thermistor, this seems like an unavoidable repair. I admittedly chose a connector with wires that are much too large, but I don't think it matters how well you secure the wires - there's a lot of energy jiggling this thing and it's all going to end up fatiguing the solder joint of that tiny wire!
My first plan is to print a little post to screw in next to the notch where you zip tie the wires so I can add more zip ties so the whip doesn't cause as much stress.
I'm also wondering if there is a way to secure the tiny wire next to the hot end.
a) place splint (that can take the heat) along wires/solder joint? I worry this may shift the stress and cause the thermistor end the break... then I'm doing a much more extensive repair.
b) use some sort of heat immune, thermally neutral, magic epoxy to encase the entire wire? I have no idea what epoxy though.
c) Is this hopeless? Is a major overhaul is inevitable? there's a youtuber (DooDad) who tapped the thermistor hole and bought a threaded one, eliminating the need for thermal glue. Worst case, even if this also breaks, it sounds much easier to repair. BUT this is a time consuming project with a non-zero dollar cost; when I have more money I'll just do the full V3.2 upgrade... so in the short term, are there thermistors with thicker wiring that I could expect to last several hundred hours?