Heat the bed and extruder at the same time

[BramV]

When I start priting, it will first heat the bed, and then when that's done it heats the extruder.
I could save some time if they heated both at the same time. Or is there some reason for not doing this?

Thank you!

Bram

[andrewk72]

Many power supplies can't handle heating everything at once, so that's why it's disabled. I know people who have broken their power supplies trying to draw too much current by heating everything at the same time.

[supinemonkey]

Many power supplies can't handle heating everything at once, so that's why it's disabled. I know people who have broken their power supplies trying to draw too much current by heating everything at the same time.

Hi. This is a very good reason to make it a user toggle with the default to off, not to disable it entirely. It's like saying everyone needs gets airbag, even kids in child seats. A bug, not a feature. The first thing I want to do when I start a print most of the time is to change the filament, and having to heat the extruder manually every time is onerous and unnecessary.

[dorsai3d]

It is defaulted to not do that in their profiles, but it's not impossible to set it up yourself. They have variables that you can use to add the temperature commands in the starting scripts (see: viewtopic.php?f=8&t=1959), and when you add any temperature variable to the start script, S3D won't add any of its own temperature commands to the startup.

So you can do:
M104 S[extruder0_temperature]
M140 S[bed0_temperature]
M109 S[extruder0_temperature]
M190 S[bed0_temperature]

and it would heat both bed and extruder at the same time, waiting for both to finish and stabilize before continuing.

[dkightley]

As a footnote to the last post.....please bear in mind the warning/disclaimer posted above:

Many power supplies can't handle heating everything at once, so that's why it's disabled. I know people who have broken their power supplies trying to draw too much current by heating everything at the same time.

[dorsai3d]

Thanks, Doug, for the footnote. I haven't had to fix a burnt out power supply recently, but I do recall a while back working on something that had an under-specced power supply and it would just fail to reach setpoint with everything on, but never burnt up the PSU.

I generally avoid heating everything at once because most machines take a long time to heat the bed, and I try to avoid holding still plastic at temp for a while.

[BramV]

Would be nice to have it as an easy option instead of having to write g-code scripts. Even better, and I think it's not too much to ask for a 150 USD program would be to have the option to start heating the extruder when the heated bed is X degrees below target temperature (or X %). I think the last 10 degrees of heating my bed is enough to heat the extruder. saves like 30 seconds to a minute of printing time

[dorsai3d]

Most firmware isn't that useful, it goes unresponsive when waiting to heat up, so any commands are handled after that, plus you have to wait ten seconds generally after hitting temperature (firmware waits to stabilize PID ringing). You can do it in gcode with a fixed temp, stabilizing the bed at almost there, then heating the extruder and bed to final temp simultaneously and waiting for both.

I doubt they'd do that for you for the same reasons that have been mentioned earlier. Most printers/electronics that I've seen people buying are already junky knock-off fire hazards to start with, why add more chance for failure? Particularly if it only saves you maybe a whole minute out of a 1 to 60+ hour process?

[Marshall]

I don't understand what's so hard about clicking the Machine Control Panel window, which can be waiting docked on-screen while S3D is open, and clicking "on" + "on" for the extruder and bed before starting the print.

The moment I know I'm going to print something, I'm turning the bed on, and setting extruder to 160°, so that plastic doesn't reach fluid temp while waiting. My extruder seems to be very negligible as far as a wait time. Well I guess it seemed a little faster than I thought. I just clocked it; 37°-235°C in 2 min 20 sec.

I started doing it that way with the MCPanel specifically because of the warm bed, then extruder routine after committing to print--I too started to get antsy.

I wouldn't mind boosting my bed power, though. If you want to talk about time... The wait from 90° to 115° alone feels like eternity! Maybe run it off of my 1200W 60A eFuel DC supply @ 24V for a quick "zap". Hmm, now I'm wondering. That can't be good.

[supinemonkey]

I don't understand what's so hard about clicking the Machine Control Panel window, which can be waiting docked on-screen while S3D is open, and clicking "on" + "on" for the extruder and bed before starting the print.

Fine if you use control panel. I print from SD as I find it a lot more reliable. Still, it's an extra step that could be simply weened out of the process and save time in workflow. Thanks to Doug for that script workaround. I will give it a try.