1 Topic by Mr_Smigs

  • Mr_Smigs
  • Member
  • Offline
  • Registered: 2012-11-14
  • Posts: 52

Topic: Max Bed Temp?

ok...
so I've still got curling for for the 1" of printer bed closes to the front of the printer, and about 1/2" on the left and right...

currently, I'm rolling the printer with a piece of pyrex heat-treated glass and hairspray (treseme seems to give the best grip for me)

and running it at a base temp around 109 degrees....


I'm wondering if the metal binder clips holding the glass on are acting like heat sinks and cooling the edges...
or if i can just run the bed higher to compensate...


so the question is,  those of you who binder-clip your glass on,  do you put an insulator between it and the glass, and if so, what?

2 Reply by elmoret

  • elmoret
  • Filastruder
  • Offline
  • Registered: 2012-10-11
  • Posts: 6,048

Re: Max Bed Temp?

Are you using an enclosure?

Filastruder - the robust, inexpensive filament extruder
E3Dv6 All Metal Hotend - the premier 3D printing hotend

3 Reply by Mr_Smigs

  • Mr_Smigs
  • Member
  • Offline
  • Registered: 2012-11-14
  • Posts: 52

Re: Max Bed Temp?

i've got foamcore on all the open sides.  the front side stops 4" short of blocking the whole thing so I can see in, but I block that with cardboard when I print.

4 Reply by elmoret

  • elmoret
  • Filastruder
  • Offline
  • Registered: 2012-10-11
  • Posts: 6,048

Re: Max Bed Temp?

The metal binder clips don't do much in terms of transferring heat.

Do you have the resistor or silicone/nichrome bed?

Filastruder - the robust, inexpensive filament extruder
E3Dv6 All Metal Hotend - the premier 3D printing hotend

5 Reply by adrian

  • adrian
  • Member
  • Offline
  • From: Canberra, Australia
  • Registered: 2013-01-15
  • Posts: 1,623

Re: Max Bed Temp?

If you check the thermal images I posted over in http://www.soliforum.com/topic/2230/the … ed-setups/ you'll see the clips and their effect on the bed temp... which is indeed negligible.

They are acting as a heat sink, but their thermal transmission is lower than the rate at which the bed heats.. so the bed stays hot, and the clips slowly heat up...

So yes they technically are dissipating heat, but at a rate that is well below what the bed heats at.

However, as you'll see in the pics, if you still have a standard Solidoodle heated bed, the drop off across the plate is in the order of 10°C edge to edge anyway... the edges are going to be much cooler than the center even on a bare bed.

6 Reply by Mr_Smigs (edited by Mr_Smigs 2013-05-13 22:30:40)

  • Mr_Smigs
  • Member
  • Offline
  • Registered: 2012-11-14
  • Posts: 52

Re: Max Bed Temp?

yeah, I have the standard bed...


again, what's the limit on temp then,
is there any notable fix on this?


BTW - saw the thermals,   are those all SD3?  (I have an SD2)

7 Reply by Randavian

  • Randavian
  • Member
  • Offline
  • Registered: 2013-01-31
  • Posts: 99

Re: Max Bed Temp?

Mr_Smigs wrote:

again, what's the limit on temp then,
is there any notable fix on this?

I've gotten my bed up to 100 c.  I've read on here that someone runs their's at 105.  It is a pain waiting on the bed to heat up, but after reading some posts I have been setting a pot holder on the bed while heating it up.  It helps quite a bit.

8 Reply by DePartedPrinter (edited by DePartedPrinter 2013-05-15 15:26:56)

  • DePartedPrinter
  • Moderator
  • Offline
  • From: Colorado
  • Registered: 2012-08-14
  • Posts: 1,478

Re: Max Bed Temp?

I think SD now limits the bed temp to 85c

^can be changed in firmware

SD2 with E3D, SD Press, Form 1+
Filastruder
NYLON (taulman): http://www.soliforum.com/topic/466/nylon/

9 Reply by elmoret

  • elmoret
  • Filastruder
  • Offline
  • Registered: 2012-10-11
  • Posts: 6,048

Re: Max Bed Temp?

DePartedPrinter wrote:

I think SD now limits the bed temp to 85c

^can be changed in firmware

I think it's a hardware limit - less powerful heating bed.

Filastruder - the robust, inexpensive filament extruder
E3Dv6 All Metal Hotend - the premier 3D printing hotend

10 Reply by pirvan

  • pirvan
  • pirvan
  • Member
  • Offline
  • From: San Francisco
  • Registered: 2013-03-27
  • Posts: 1,797

Re: Max Bed Temp?

I have a standard SD3, and I cranked the software up to 110° just to see how hot it can get, and about 98°C was the max. it got to.

To print or, 3D print, that is the question...
SD3 printer w/too many mods,  Printrbot Simple Maker Ed.,  FormLabs Form 1+
AnyCubic Photon, Shining 3D EinScan-S & Atlas 3D scanners...
...and too much time on my hands.

11 Reply by pmerana

  • pmerana
  • Member
  • Offline
  • Registered: 2013-04-13
  • Posts: 44

Re: Max Bed Temp?

the heated bed limit is due to 12V not being able to heat the bed hot enough, the software does not even begin applying PWM to the bed, you mind as well plug 12V into the bed. The problem is the heat is being synced off to the ambient environment. An enclosure helps this greatly as the ambient air can warm up a bit.