Think your connections are still tight? I did too, until I smelled hot plastic during a print. The melted terminal is for the heated bed, which is a silicone encased element that’s right at the edge of what a RAMPS board can handle. I believe the problem was repeated heating/cooling cycles causing the screw to slowly loosen. I was able to resolder it and keep working, but replacement terminals and a lower-wattage heater are clearly in order.
je vois le problème un défaut de fabrication il vaux mieux soudé les câbles que de les viser
I had something similar happen. I’m pretty sure these kinds of screw terminals do not handle vibration very well.
I’m moving towards soldered plug connectors.
Screw terminals are OK if you provide redundancy. Don’t just rely on a single terminal for a high current connection.
Was your wire tinned, or the bare copper strands? I’m just curious as solder tinned leads can provide less surface area for electrical conduction in these weak clamping force terminals than bare copper strands which can be crushed for best contact area in the terminal.
@Jon_Caywood
I’m not sure - possibly tinned if the leads came that way, but I don’t remember. They’re bare copper now, but in any event I’m going to replace the silicone bed with a PCB heater, which should be considerably less current draw.