MP Select Mini V1. I had it running pretty well, then suddenly the hot end reports 0°. Test, yup, thermistor is bad. I have one on hand! I pull things apart and replace it. Now at idle it is report about 24° where as before it (and the hot bed) reported about 19°, ok, so worst case I’ll go 5° higher. The reading if I hold the thermistor between my fingers is 33° which is pretty close. I start a print and it comes out like a lace doily. hmmm. I point a non-contact thermometer at the hot end and I can only get about 188° when the temp is set to 200-215°,.
according to the MP Select mini wiki I have the correct 3950 thermistor. After fiddling around a bit, I now seem to have other symptoms hinting at a clog. Time to pull apart the hot end…..