120v Silicone Bed Heater FTW!
October 14, 2016 04:29PM
Upgraded from 12v to a 120v 750W 300x300 Silicone Heater
and wow my heated bed goes from cold to 80 degrees in under 2 min
smiling smiley


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Re: 120v Silicone Bed Heater FTW!
October 14, 2016 08:32PM
There's nothing like adequate power!


Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: 120v Silicone Bed Heater FTW!
October 15, 2016 09:29AM
Yeah I'd second that, I've gone from bad 12v PCB bed, to better 12v PCB bed, to 24v PCB bed to 500w 240v silicone heater over the course of various printers. Not going back to DC any time soon.


Simon Khoury

Co-founder of [www.precisionpiezo.co.uk] Accurate, repeatable, versatile Z-Probes
Published:Inventions
Re: 120v Silicone Bed Heater FTW!
October 15, 2016 09:48AM
When you have adequate heater power, the bed heats up fast and you don't need to insulate the underside which increases cool-down time. It's a win-win situation. How many of those do you run into with 3D printing?

Now get rid of the thermal insulating glass plate on top, use a cast aluminum tooling plate on a 3 point leveling system, and you have the ultimate in 3D print bed performance.

Don't forget to turn on PID temperature control!


Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: 120v Silicone Bed Heater FTW!
October 15, 2016 09:58AM
One thing you have to be careful of with high powered heaters is build plate warp. I think Marlin, by default, uses bang-bang control of the heat bed rather than PID control. Because of this, you will invariably get temperature overshoot, which is proportional to the amount of excess power you have (peak power / avg power needed). Depenging on your build plate/heat bed construction, this temp cycling can warp the plate enough to create noticable ridges in the print surface.

I've got an 800w, 350mm sq heater that was overshooting about 5 deg C. It is stuck on an aluminum plate and I print on the other side without glass. That 5 deg variation warped the plate enough to create visible ridges in my prints as the plate cyclically heated and cooled. I now run the 120v heater thru a high power dimmer that I crank up while heating up the bed, but then turn down to the bare minimum while printing. At the lower power setting, I get less than 1 deg variation, and my ridging diappeared.

(I think I tried switching to PID control, but had trouble getting that working. There may have been issues with trying to drive the SSR with a chopped input.)
Re: 120v Silicone Bed Heater FTW!
October 15, 2016 10:45AM
I am using PID for the Bed. with a 6MM Alum Bed (Not Cast)


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Re: 120v Silicone Bed Heater FTW!
October 15, 2016 12:38PM
Quote
LoboCNC
(I think I tried switching to PID control, but had trouble getting that working. There may have been issues with trying to drive the SSR with a chopped input.)

SSRs can switch fast enough to keep up with PID, but if you have problems, you can always reduce the PID max switching frequency. Marlin defaults to 20 Hz IRIC, but I used to run at 8 Hz max when I was switching AC power into a transformer to run the heater in my printer. No problems. You do need to run the PID autotune on it once it is wired and the config parameters are set.

A lot of plate warping problems go away with 3 point leveling and PID temperature control.


Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: 120v Silicone Bed Heater FTW!
October 15, 2016 01:24PM
Quote
makerparts
Upgraded from 12v to a 120v 750W 300x300 Silicone Heater
and wow my heated bed goes from cold to 80 degrees in under 2 min
smiling smiley

Install a thermal fuse, that bed can get very hot.
Re: 120v Silicone Bed Heater FTW!
October 15, 2016 01:34PM
Thats a good idea, can you suggest a model/part for the thermal fuse.


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Re: 120v Silicone Bed Heater FTW!
October 15, 2016 01:37PM
These are the one I got: [www.ebay.com]
Re: 120v Silicone Bed Heater FTW!
October 15, 2016 02:06PM
Do these simply get wired in line with the silicone heater? How do they detect the temperture? Of the bed?


Makerparts.ca
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Re: 120v Silicone Bed Heater FTW!
October 15, 2016 02:12PM
Wired inline with one of the bed's power leads, and I tape it to the heater in about the center. They detect the temp by being in contact with the heater. If it ever trips, you have to replace it.
Re: 120v Silicone Bed Heater FTW!
October 15, 2016 03:55PM
I search today for a 120V (110V) silicone circular 300mm looking for around 350W and find nothing.. they all 500W for that size.

@makerparts did you manage to find a supplier in canada or you went to china ?
Re: 120v Silicone Bed Heater FTW!
October 15, 2016 03:55PM
If you're really concerned about safety, tape is not the way to attach the fuse to the bed. If the tape lets go, the fuse won't do its job. Use a screw to clamp it to the bed. Even a bulldog clip would be better than tape.


Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: 120v Silicone Bed Heater FTW!
October 15, 2016 05:36PM
So how can i hook one of these thermal fuses to a E3D v6


Makerparts.ca
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Re: 120v Silicone Bed Heater FTW!
October 15, 2016 09:43PM
You can't get thermal fuses that are rated for the temperature we use on the heater block, so mount it on the heatsink.


Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: 120v Silicone Bed Heater FTW!
October 17, 2016 11:00AM
Hi guys
I have a 24V 270W silicone bed with 24V 350W power supply
I go to 90 degree in 40 minutes...........a biblic time!
I'd like to solve this issue but I don't understand how I can power a 120V bed!!
Can someone suggest me the right components?
I have a fuse on my electronic board about 15A
It's not clear for me how can I proceed, without burning risks.....
Re: 120v Silicone Bed Heater FTW!
October 17, 2016 11:41AM
How large/thick is your printer's bed and what is it made of?

Your power supply should be able to get that heater going just fine. Have you measured the voltage at the heater when the power is on? How are you switching power to it? Maybe there is some voltage drop in the switch and/or the wires to the heater.


Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: 120v Silicone Bed Heater FTW!
October 17, 2016 11:50AM
Double check that your power supply is set to the proper voltage.
I accidentally had my power supply on 220v but it should have been set to 110v

when it was set incorrectly. my previous 12v silicone heater didnt have enough juice to warm past 50 degrees and it was slow.
flip the switch and its fine

worth a check.


Makerparts.ca
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Re: 120v Silicone Bed Heater FTW!
October 17, 2016 11:59AM
silicone bed is glued to an aluminium plate with 3mm thickness
I have 24V measured at the heater when powered
I switch power by repetier host
Re: 120v Silicone Bed Heater FTW!
October 17, 2016 12:02PM
Quote
makerparts
my previous 12v silicone heater didnt have enough juice to warm past 50 degrees and it was slow.
flip the switch and its fine

worth a check.
This is the same for me, for the first 50 degrees heat is acceptable
In any case I find it difficult to exceed 90 degrees

Edited 1 time(s). Last edit at 10/17/2016 12:07PM by mdcompositi.
Re: 120v Silicone Bed Heater FTW!
October 17, 2016 12:13PM
Quote
makerparts

flip the switch and its fine

worth a check.
what do you mean?
Re: 120v Silicone Bed Heater FTW!
October 17, 2016 12:16PM
Power supply has a switch to flip from a input voltage of 220 or 110.
is yours set correctly?


Makerparts.ca
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Re: 120v Silicone Bed Heater FTW!
October 17, 2016 12:21PM
I have two power supply
One about 12V for hotends and fans and a second 24V for heated bed
the first have on external a switch for 110/220V
the second of 24V don't have externally any switch
this is heated bed power supply
[www.ebay.it]
ECJ
Re: 120v Silicone Bed Heater FTW!
October 17, 2016 12:57PM
Quote
mdcompositi
Hi guys
I have a 24V 270W silicone bed with 24V 350W power supply
I go to 90 degree in 40 minutes...........a biblic time!
I'd like to solve this issue but I don't understand how I can power a 120V bed!!
Can someone suggest me the right components?
I have a fuse on my electronic board about 15A
It's not clear for me how can I proceed, without burning risks.....

You can use a circuit like this:

For 12V output, replace the resistor 220R to 680R, and 24V replace to 1.5K
My silicone bed 220v 300W hit 115 degrees in 3 minutes!
Re: 120v Silicone Bed Heater FTW!
October 17, 2016 01:06PM
for a 120v Heated bed. you connect it from the mains 120v power into a SSR (Solid State relay) that is controlled via PID on your 3d controller.


Makerparts.ca
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we are proud to be an official Openbuilds distributor.
Re: 120v Silicone Bed Heater FTW!
October 17, 2016 01:32PM
How do i set to so the Left and right eye images are stacked vertically instead of being side by side?


Makerparts.ca
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Re: 120v Silicone Bed Heater FTW!
October 17, 2016 03:54PM
Quote
ECJ
Quote
mdcompositi
Hi guys
I have a 24V 270W silicone bed with 24V 350W power supply
I go to 90 degree in 40 minutes...........a biblic time!
I'd like to solve this issue but I don't understand how I can power a 120V bed!!
Can someone suggest me the right components?
I have a fuse on my electronic board about 15A
It's not clear for me how can I proceed, without burning risks.....

You can use a circuit like this:

For 12V output, replace the resistor 220R to 680R, and 24V replace to 1.5K
My silicone bed 220v 300W hit 115 degrees in 3 minutes!
It's difficult for me To understand this electronic scheme
Needs a customized circuit board?
I prefer for example a picture...
ECJ
Re: 120v Silicone Bed Heater FTW!
October 17, 2016 05:56PM
Quote
mdcompositi
It's difficult for me To understand this electronic scheme
Needs a customized circuit board?
I prefer for example a picture...


Re: 120v Silicone Bed Heater FTW!
October 18, 2016 02:05AM
Wow!!
thank you for pic!
......and I can use my 24V-270W silicone bed with 24V-350W power supply?
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