Re: Help replace dead hotend heater (Ohm's Law and Rated Wattage)
QuoteNoobManIf effective dissipation and/or temp is higher than rating, then should expect the life of the resistor to be much shorter. These ratings assume the resistor to be surrounded by air. As...
View ArticleRe: Help replace dead hotend heater (Ohm's Law and Rated Wattage)
You are right, the general consensus is that so if we heatsink it we increase its rating. I just think the net worth of this is not necesarily predictable. Let's say we put the resistor inside a...
View ArticleRe: Power Supply Problem
[reprap.org] This is what i followed. Everything went together smoothly and i am able to communicate with the arduino. I have installed marlin firmware (Was getting a "Printer stopped due to errors"...
View ArticleRe: Power Supply Problem
Quotetimmit99 [reprap.org] This is what i followed On this page neither electronics nor power supplies are mentioned at all.
View ArticleRe: Power Supply Problem
Please don't get me wrong. Plunking down vague blobs of information doesn't allow to help and the fact you need help other than reading the wiki is a problem in it's self already. So let's fix the...
View ArticleRe: Help replace dead hotend heater (Ohm's Law and Rated Wattage)
QuoteNoobManYou are right, the general consensus is that so if we heatsink it we increase its rating. I just think the net worth of this is not necesarily predictable. IMO, heatsinking a heating...
View ArticleRe: Help replace dead hotend heater (Ohm's Law and Rated Wattage)
From your answers I decided to purchase a 5w 5.6ohms and a 5w 6.8ohms. Those things are way bulkier than the one I had. Side by side I would have never though the smaller one was an 8w (and now I...
View ArticleRe: Help replace dead hotend heater (Ohm's Law and Rated Wattage)
Correction: 225 should be ~23w and ~2amps. Update: I tried with the firmware output at 225 and when I send a print the PSU shuts down again. Took the output in the firmware down to 200 and it works...
View ArticleReplacing Melzi stepper drivers?
Hello, I blew out the stepper driver for my extruder on a Melzi v1 and I don't have the cash to get a new board. Has anyone ever successfully desoldered and soldered on a new a4988 IC on a Melzi? I...
View ArticleRe: Power Supply Problem
My problem was that the 5V line on the power supply needed a load applied to it. I had used some 5W load resistors from my parts bin but I guess it wasn't enough. So i found an old CD drive and...
View ArticleRe: Help replace dead hotend heater (Ohm's Law and Rated Wattage)
QuoteMRGiacalone2005I tried with the firmware output at 225 and when I send a print the PSU shuts down again. See [reprap.org]
View ArticleRe: Replacing Melzi stepper drivers?
You can do it, but you have to improve your soldering skills a bit, be patient and very attentive :) You need a low power soldering iron (e.g. 20-30W) or better a soldering station, with a relatively...
View ArticleRe: Help replace dead hotend heater (Ohm's Law and Rated Wattage)
I am curious, are those ceramic cartridge heaters prone to failure? I have seen them for sale for as low as 3$, are they even worth considering? Or film resistors all the way?
View ArticleRe: Replacing Melzi stepper drivers?
Thanks for the tip I will try your method, I never thought of cutting the chip out with a dremel. Thanks!
View ArticleRe: Help replace dead hotend heater (Ohm's Law and Rated Wattage)
Thanks for the reference to the PSU set-up. I have a new PSU but don't have time to test it yet. Meanwhile, it turns out that the volts were actually changing but only at the end of the heating. The...
View Article24V to 12V Heater
Hi I tried with 24V DC Power Supply, The problem is, I have 12V ceramic heater which need to work with 24V, so I thought to use a buck dc converter I measured the current in the heating element...
View ArticleRe: 24V to 12V Heater
The obvious alternate option is to buy the proper 24V heater. If you are referring to the hotend heater, they are $6.99 US or less.....
View ArticleRe: 24V to 12V Heater
Thanks Vreihen, me too think this is the best option so far but I want to explore on another aspect too ! :)
View ArticleRe: 24V to 12V Heater
Explore changing the heater duty cycle in firmware. :) I know there's a duty cycle setting for heated beds that others are using to run a 12V heated bed from 24V.....
View ArticleRe: 24V to 12V Heater
There is no such thing like a "12V"-heater. A heater is a heat-withstanding resistor, no more, no less. You can apply any voltage as long as you manage to deal with the produced heat. If you apply 24V...
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