Hi all, I'm interested in creating a heated bed, as here in the UK I can't find any available that will fit my printrbot simple 1405. Smallest I've seen is 210x210mm, which is too large. I've seen loads of posts talking about DIYing them but several things still puzzle me even after searching for answers. I'm sure they are dumb questions but I don't want to end up frying anything so best to ask first.
-How do people regulate the temperature of their DIY beds? Is this simply done by using Repetier software after plugging a DIY heated bed and a 100k thermistor into the printrbot circuit board?
-I want to use this 500W atx psu I have spare. Is it suitable please? Pic attached below.
-I read somewhere that you need 105C rated thick wires to take the current when attaching to a bed? Would standard UK 3pin power cables work for this? I think they are only rated about 80C. Is the 105C type crucial?
-I've connected the green+black power lead wires of my PSU so it powers up without a switch. I believe the yellow+black 4 pin plug can be plugged directly into the printrbot circuit board. I read somewhere that you need to put something on the wires to make it all safe. I can't find where I read this so does anyone know what might be needed?
-My plan is to use nichrome wire and create a 6x4" bed. Is a certain gauge of wire required or will thin stuff from a old hair dryer work fine?
-I've read you can't use normal solder on nichrome wires. I have some silver solder (I've made silver jewellery in the past) so will this be suitable to attach the nichrome to the power cables?
In retireejay's post here:viewtopic.php?f=6&t=3922
... the pic shows the heated bed connector has 4 pins. Which pins are which? Is it 1x positive 2x ground 1x negative? Do all 4 have to be connected or can you just use two pins?
Thanks for any assistance.
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