I hope it is not a sacrilege if I confess here that I use

3D Printing
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1

I hope it is not a sacrilege if I confess here that I use a MKS SBASE
If yes, then sorry and I will not ask again.

Does anyone know how much ampere the heatbed mosfet can manage?
There is a heatsink, but it is not very large and shared with the other mosfets.

My new heatbed will need around 16.66 ampere. Somewhere I have read that the mosfet will allow 300 ampere shortly, but only with proper cooling. But I am not sure that the guy who wrote this is right.

This makes me nervous a little bit.

2

Doubtful that the connectors themselves would handle that. I’m always a little bit nervous when it comes to those Chinese connectors. Can you read a model number off the Mosfet?

3

As I told, they are covered by a heatsink. Regarding the connectors, they look even better than that of the power supply.

4

Okay, I just tried it. No noises like the chirping of cicadas from the power supply. A fanless 25 A type. The heatsink of the mosfet stays under 35°C. I heated the bed up to 130°C and the time between 120 to 130°C was the same like from 110 to 120°C. So there are still reserves. I only forgot to measure the time of the whole process. It was felt like 5 minutes.
So I have now replaced the heatbed of my Tronxy X3 completely. Partly with parts designed by myself and it looks like I did it right.

5

I have the same board on one of my machines. But i use ssr’s on my machines. On the ramps it was to stop the connections from melting. But on this one its because it hate to damage a component seeing as its all onboard.