Hi I'm on final stages (I hope...) of designing a 3d printer. I was looking at the RAMPS 1.4 current supply and it seems that it can deliver 11A which is probably enough for 1 heatbed. What can be done if I need 2 heated beds? thanks https://reprap.org/forum/read.php?219,578010,578010#msg-578010 Tue, 21 Jul 2026 09:18:46 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?219,578010,578821#msg-578821 https://reprap.org/forum/read.php?219,578010,578821#msg-578821
I found the robert's heated bed
[www.reprap.org]

Seems pretty easy and gives me all the flexibility I want for my design.
I'll use it with 400X200 aluminum plate, 3mm thick
I'll calculate the wire for about 300w.

Is there a problem to use 24v?
He said he wouldn't use more than 12v, but I think it was because he couldn't change the resistance after the assembly]]> Shachar85 RAMPS Electronics Mon, 02 Nov 2015 09:22:09 -0500 https://reprap.org/forum/read.php?219,578010,578775#msg-578775 https://reprap.org/forum/read.php?219,578010,578775#msg-578775 dc42 RAMPS Electronics Mon, 02 Nov 2015 07:33:04 -0500 https://reprap.org/forum/read.php?219,578010,578711#msg-578711 https://reprap.org/forum/read.php?219,578010,578711#msg-578711 Going to silicone heater will require big changes in the design, which I don't really want to do right now.

Is there any major advantage for the silicone heater that worth the effort? other than faster heating time]]> Shachar85 RAMPS Electronics Mon, 02 Nov 2015 05:30:35 -0500 https://reprap.org/forum/read.php?219,578010,578697#msg-578697 https://reprap.org/forum/read.php?219,578010,578697#msg-578697 www.aliexpress.com] will make a silicone heater to your size, voltage and power specifications for relatively little money. I advise against using 12V for a heater of that size because it would need 20A or more current. If you go for 24V 10A or perhaps 12A, then any 24V-capable electronics should be able to drive it directly.]]> dc42 RAMPS Electronics Mon, 02 Nov 2015 05:02:08 -0500 https://reprap.org/forum/read.php?219,578010,578660#msg-578660 https://reprap.org/forum/read.php?219,578010,578660#msg-578660 Every now and then I encounter a big issue I haven't though of and I'm glad I find it now and not after I bought all the parts.

I was looking for silicone heaters. 200X400 are hard to find and if I do, they cost more than $50.
That might not be a lot, but I rather spend this money in other parts. 2 MK2B cost less than $20

I wasn't aware of the sevenswitches. Glad I know it now.

As I see it, the best option (money taken in account):
- a big 12v PSU. let's say 400w. (Any advantage in using 2? 12V+24V?)
- 2 MK2B
- 2 sevenswitches
still using Ramps 1.4....

What do you think about that?]]> Shachar85 RAMPS Electronics Mon, 02 Nov 2015 03:46:48 -0500 https://reprap.org/forum/read.php?219,578010,578635#msg-578635 https://reprap.org/forum/read.php?219,578010,578635#msg-578635 enif RAMPS Electronics Mon, 02 Nov 2015 01:37:00 -0500 https://reprap.org/forum/read.php?219,578010,578391#msg-578391 https://reprap.org/forum/read.php?219,578010,578391#msg-578391
If you use two PSUs (24V for the bed, and 12V for everything else) then you can use RAMPS. But using two PSUs is over complicated IMO.

Do not use a DC-DC SSR. The cheap ones are useless, they have a voltage drop of 1.5 to 2V which greatly reduces heating power and makes them get very hot - which means they fail unless you use a big heatsink and fan to cool them. The ones that are adequate cost more than a modern 32-bit controller board that can use a 24V supply.

The SevenSwitch is good to about 15A AFAIR, so it won't drive two standard 120W bed heaters. I guess you could use two of them, one for each heater.]]> dc42 RAMPS Electronics Sun, 01 Nov 2015 12:57:54 -0500 https://reprap.org/forum/read.php?219,578010,578383#msg-578383 https://reprap.org/forum/read.php?219,578010,578383#msg-578383 finally found this
[www.ebay.com]
and this
[www.ebay.com]

thanks for the tip]]> Shachar85 RAMPS Electronics Sun, 01 Nov 2015 12:34:39 -0500 https://reprap.org/forum/read.php?219,578010,578376#msg-578376 https://reprap.org/forum/read.php?219,578010,578376#msg-578376 sevenswitches to power the heatbeds?]]> enif RAMPS Electronics Sun, 01 Nov 2015 12:07:34 -0500 https://reprap.org/forum/read.php?219,578010,578333#msg-578333 https://reprap.org/forum/read.php?219,578010,578333#msg-578333 gmckee RAMPS Electronics Sun, 01 Nov 2015 10:30:05 -0500 https://reprap.org/forum/read.php?219,578010,578174#msg-578174 https://reprap.org/forum/read.php?219,578010,578174#msg-578174 will use ssr
thanks!]]> Shachar85 RAMPS Electronics Sun, 01 Nov 2015 02:29:16 -0500 https://reprap.org/forum/read.php?219,578010,578089#msg-578089 https://reprap.org/forum/read.php?219,578010,578089#msg-578089 Your better option would be to get a 120v silicone heater. You can get them custom made on allies press for not to much money and have the bed heat up quicker.]]> gmckee RAMPS Electronics Sat, 31 Oct 2015 18:54:22 -0400 https://reprap.org/forum/read.php?219,578010,578010#msg-578010 https://reprap.org/forum/read.php?219,578010,578010#msg-578010
I'm on final stages (I hope...) of designing a 3d printer.
I was looking at the RAMPS 1.4 current supply and it seems that it can deliver 11A which is probably enough for 1 heatbed.
What can be done if I need 2 heated beds?

thanks]]> Shachar85 RAMPS Electronics Sat, 31 Oct 2015 15:50:32 -0400