EternalPath
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
Maybe there is a fuse as well with a higher blow temperature in case the thermostat switch fails?
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
So it's not actually a fuse. It's a bimetal thermostat switch
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
From the keenovo website:
If your heater comes with a built-in thermostat, please kindly note that the thermostat, being mechanical (bi-metal and snap action), should not be considered as a precise temperature control device, but as an auto-regulating and over-heating protection device. Its action temperatures may be subjected to certain tolerances or hysteresis due to factors such as heater power rating, ambient temperatures and heat consumption/loss rate etc.
https://keenovo.store/products/keenovo-square-silicone-heater-3d-printer-build-plate-heatbed-heating-pad
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
If not, then contact ratrig.
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
Only issue that could be your fault is if you changed the thermistor configuration in ratos
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
So it's faulty.
However, the thermistor could also be the issue if it's faulty or set to the wrong type on your firmware config so ratos thinks it's at 100 but it's really at 150 already.
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
Yea that's the thermal fuse activating at 100C instead of 150,C
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
Resistance should be 12ohms for a 1200W 120V heater pad
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
To measure the resistance you have to disconnect it from the SSR and measure between the power wires.
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
Not sure how you are measuring resistance of the bed heater with it powered on?
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
Otherwise, heating it until it stops heating and then immediately measuring the resistance should tell you of the thermal fuse has triggered
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
You can do that if you are confident you can avoid getting shocked by the exposed 120v wires while it's powered with a multimeter in series :kekw:
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
But 1600ohms is not right.
What power/size is your bed heater?
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
Right you are it has a resistance not a short circuit, 😛 I just woke up when I wrote that
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
Voltage doesn't run through the bed. It is applied to it. Current runs through. You can have voltage without current.
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
If it's open circuit (no continuity) then the thermal fuse has activated). It resets when it cools down.
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
Heat it up to 105 and wait for the error, then cut power to the printer and use a multimeter to check continuity between the Heater power wires.
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
Looks like the thermal fuse is faulty and it is activating at 100C instead of the spec value of 150.
47 replies
RRCRat Rig Community [Unofficial]
•Created by Aidan on 4/26/2025 in #fix-my-printer
Bed Heater Failing on long heating segments
What bed heater? Is it the keenovo one ratrig supplies?
47 replies
RRCRat Rig Community [Unofficial]
•Created by fish on 2/9/2025 in #fix-my-print
persistent top layer smush
Settings which affect this:
Filament diameter
Extrusion multiplier
Extrusion width
I think that's all?
10 replies