Ormerod1 PSU mods to print ABS September 16, 2014 10:28PM |
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Re: Ormerod1 PSU mods to print ABS September 17, 2014 04:34AM |
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Re: Ormerod1 PSU mods to print ABS September 17, 2014 05:40AM |
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Re: Ormerod1 PSU mods to print ABS September 17, 2014 06:34AM |
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Re: Ormerod1 PSU mods to print ABS September 17, 2014 06:44AM |
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Re: Ormerod1 PSU mods to print ABS September 17, 2014 08:04AM |
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Re: Ormerod1 PSU mods to print ABS September 17, 2014 09:09PM |
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Re: Ormerod1 PSU mods to print ABS September 18, 2014 03:39AM |
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Which conclusion is that, btw?Quote
melbcycle
Looks like many people have come to the same conclusion.
Re: Ormerod1 PSU mods to print ABS September 18, 2014 07:15AM |
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Re: Ormerod1 PSU mods to print ABS September 18, 2014 08:39AM |
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Re: Ormerod1 PSU mods to print ABS September 18, 2014 08:43PM |
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Re: Ormerod1 PSU mods to print ABS September 19, 2014 06:51AM |
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Re: Ormerod1 PSU mods to print ABS September 19, 2014 08:52AM |
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Quote
melbcycle
...represents fully unacceptable design.
Re: Ormerod1 PSU mods to print ABS September 19, 2014 10:28AM |
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Re: Ormerod1 PSU mods to print ABS September 19, 2014 12:04PM |
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Re: Ormerod1 PSU mods to print ABS September 19, 2014 12:24PM |
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Re: Ormerod1 PSU mods to print ABS September 25, 2014 05:34AM |
Registered: 9 years ago Posts: 1 |
You have done great job..I do need to build similar hot bed so I will follow your post information..Quote
melbcycle
Hi forum. I've modded a new PSU to print ABS. I've taken some photos and have some advice for people which has been figured out during the course of trying to get ABS going. Thought I'd post here as it may be useful to others.
Firstly the original PSU cannot work. The regulation for the required current is out of spec (see manufacturers ratings and ATX PSU standard).
The PSU was replaced with a modded ANTEC unit (have pics, hopefully I can add them here). The Antec unit has a potentiometer under the power inlet connector (VR1). I turned this fully clockwise to get 12.5V.
Secondly, standard PSU wire cannot actually deliver 30 amps of currect without a significant voltage drop. Physics shows us that the resistance of a wire is related to the square of its diameter (because the area of a circle, discovered by Pythagoras, is pi*r*r). I removed all the original 12V wires and replaced them with some solar kits wire I had lying around.
It may be beyond peoples ability to hack the PSU. If you don't feel confident doing this then stop reading now. There are dangerous voltages in side a PSU and they are present even when you've disconnected the power cord.
Essentially what I did was unsolder the original wires, then drilled a large hole for the new wires. The 12V bypassed the original Ormerod power control box and went directly to the Duet (essentially because there was a significant voltage drop that occured by going through that unit).
Also a piece of cardboard was inserted under the PSU board to provide electrical insulation just in case my poor soldering made contact with the case.
The unit is now in operation and successfully printing ABS. However, a further mod was required to get the power from the Duet PCB to the hot bed. Again some solar panel wire was used and soldered to the Duet in the provided empty connector pads on the PCB. The wires are cable tied to the top of the Z axis and make a big loop down to the bed. I have a picture somewhere which I'll post.
I can now get 120 degrees and beyond from the hot bed.
I also discovered that hairspray, while goodish, is no match for acetone-ABS slurry on tape mentioned in these forums.