The battle to revitalize my old printer continues.
In the past number of days:
- Burned out a 24v step-up converter.
- Calibrated kinematics (steppers, microsteps, current, voltage, etc)
- Found the TMC2240 produce excess heat at 36v, lowered to 28v.
- Burned out a 20A fuse.
- Calibrated a PT100 to “work” with an amplifier, had to mess with voltages a lot to get decent readings.
- Overpowered my 350W power supply at full heating load.
- Crimped, spliced, cut, etc MANY wires.
I had some printing working for PA-CF at 280C (70C bed) but continued to have warping issues and blew a fuse trying to get to 85c for the bed. Overall it’s been a huge challenge printing such a material with a 0.4mm nozzle on a glass bed.
After some thermals stopped reading, I checked the bed heater output and found there was no current due to a blown fuse. So now I have fuses on order along with a stronger MOSFET module to manage the bed heating.
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