Delayed Start
-
Sometimes I need to give my printer 5-10 for bed to stabilize. and I would like to be able to Hit run on a job with a delay.
Select the job, right click, and Start in 10min for example. -
If that is a consistant requirement for every print you could add a G4 S# where # is seconds delay to start.g that gets called at the start of each print.
-
@adamfilip or a message box with a timeout after the heating command? That way you can cancel the delay if the bed is already up to temp
-
@engikeneer For my machine that has a 1/2" thick alum bed + spring steel + PEi, the bottom temp will reach goal temp quickly but I tend to give it 10min to soak in, upon first heat up. but between print jobs, if im quick to start another I dont have any delay as its already warm. thats why I dont put gcode in the print files..
-
@adamfilip said in Delayed Start:
@engikeneer For my machine that has a 1/2" thick alum bed + spring steel + PEi, the bottom temp will reach goal temp quickly but I tend to give it 10min to soak in, upon first heat up. but between print jobs, if im quick to start another I dont have any delay as its already warm. thats why I dont put gcode in the print files..
I had that problem when I first put my printer together but there is another issue too. The usual position for the temperature sensor is in the middle of the heater (assuming you use a silicone mains heater which would be the norm for that sort of bed), so it senses the temperature at the junction between the heater and the bottom of the plate. So what happens is that the heater turns on, the sensor "sees" a rapid rise in temperature at that junction point, so the heater turns off. But the rest of the plate is still relatively cold so then the temperature (at the junction) drops, the heater comes back on, and the cycle continues until eventually the upper surface gets to the desired temperature. But that on-off-on cycling slows down the overall warm up time. My solution was to drill a 3mm dia hole in the edge of the aluminium plate, as deep as I could and as close to the top edge as possible and fit another sensor in that hole - effectively moving it closer to the top edge. It cuts out the on-off cycling and the net result is that the bed warms up much faster, and you don't have to wait too long for the upper surface to reach temperature.
-
@deckingman wouldnt that lead to the heater over heating the middle, and then backing off. if it takes a while for the edge to warm up. the middle might get hotter then was requested
-
@adamfilip said in Delayed Start:
@deckingman wouldnt that lead to the heater over heating the middle, and then backing off. if it takes a while for the edge to warm up. the middle might get hotter then was requested
The heater may indeed reach a temperature higher than the set point - but not dangerously so. Mine has been running like this for quite a few years. Which is more important, the temperature of the heater on the underside of the aluminium plate, or the temperature of the build surface? I know what I think but it's your printer and your choice.
