Welcome! Log In Create A New Profile

Temp drop on hot end and hot bed

hellorous

Temp drop on hot end and hot bed
January 24, 2014 10:40AM

Registered: 11 years ago
Posts: 82

I was wondering what would cause a hot end and hot bed not to maintain temperature while printing. Low wattage? I have a light 12v(car) running, hot end,hot bed, and fan. 400w atx psu

Reply Quote

cat.farmer

Re: Temp drop on hot end and hot bed
January 24, 2014 11:49AM

Registered: 11 years ago
Posts: 466

Connect a volt meter to your power supply on the 12volt rail. Run a print and see if the voltage drops while printing.my guess is you power supply is dropping out. Does the hotend stay at temp with the heatbed off?

Edited 1 time(s). Last edit at 01/24/2014 11:50AM by cat.farmer.

Reply Quote

hellorous

Re: Temp drop on hot end and hot bed
January 24, 2014 12:09PM

Registered: 11 years ago
Posts: 82

Yes hot end seems to stay at temp 230 while hot bed off.

Reply Quote

hellorous

Re: Temp drop on hot end and hot bed
January 24, 2014 12:39PM

Registered: 11 years ago
Posts: 82

Alright i lied temp suppose to be at 230 now at 218..? :/ 1-2 hrs later

Reply Quote

hellorous

Re: Temp drop on hot end and hot bed
January 24, 2014 12:49PM

Registered: 11 years ago
Posts: 82

Ordered a 12v Dc 30a 360w Regulated Switching Power Supply.

Reply Quote

brnrd

Re: Temp drop on hot end and hot bed
January 25, 2014 09:49AM

Registered: 13 years ago
Posts: 1,780

The wattage of the ATX power supply is not what matters. You have to look at the rating of the +12V output. You need at least 18 A.

Reply Quote

hellorous

Re: Temp drop on hot end and hot bed
January 25, 2014 12:28PM

Registered: 11 years ago
Posts: 82

25A

Reply Quote

brnrd

Re: Temp drop on hot end and hot bed
January 25, 2014 12:34PM

Registered: 13 years ago
Posts: 1,780

That should be plenty. Did you put a load on the +5V rail? Most ATX supply seem to need a load there or they won't put full voltage on the 12V rail. I don't know why this is so. I have a wirewound resistor 10 ohm resistor on mine that I got from Radioshack.

Reply Quote

hellorous

Re: Temp drop on hot end and hot bed
January 25, 2014 12:44PM

Registered: 11 years ago
Posts: 82

No I did not I purchased a 12v car light to run it on 5v but ended up just hooking it on 12v rail because on 5v it was dim(light)lol.

Reply Quote

brnrd

Re: Temp drop on hot end and hot bed
January 25, 2014 12:46PM

Registered: 13 years ago
Posts: 1,780

Try connecting the light on the 5V rail again and see if that helps.

Reply Quote

hellorous

Re: Temp drop on hot end and hot bed
January 25, 2014 12:46PM

Registered: 11 years ago
Posts: 82

I read some where that I could use the light to put a load on it but like I said I have it hooked up to 12v instead. I ll try what you said because i really dont want to move my light or replace it.