520ST PSU Remake

Repairs & upgrades.
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exxos
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Re: 520ST PSU Remake

Post by exxos » Thu Apr 18, 2019 2:30 pm

rubber_jonnie wrote:
Thu Apr 18, 2019 2:26 pm
Interesting. For me the bottom section was estimated at 5h 43 with 20% infill at .3mm. Top was 6 hours exactly. I can't remember travel times and print speeds off the top of my head.

@ .2mm both were 7 hours +.

I should be able to add a pic of the top sometime tonight.
0.3mm layers gives me 3hours 3mins.

0.2mm 4H 17mins.

0.12 (my default currently) 6H 38mins.

So I may try 0.2mm on my boxes next...
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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Re: 520ST PSU Remake

Post by rubber_jonnie » Fri Apr 19, 2019 9:08 am

As promised, here is the top of the case:
IMG_20190419_090514.jpg
IMG_20190419_090514.jpg (253.29 KiB) Viewed 613 times
Next is cleanup and final assembly.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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Re: 520ST PSU Remake

Post by exxos » Fri Apr 19, 2019 9:17 am

Looking nice!
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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Re: 520ST PSU Remake

Post by PhilC » Fri Apr 19, 2019 9:29 am

Looks great RJ. How long dud it take to design it?
If it ain't broke, test it to Destruction.

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Re: 520ST PSU Remake

Post by rubber_jonnie » Fri Apr 19, 2019 9:31 am

And some more pics.

Top and bottom together:
IMG_20190419_092406.jpg
IMG_20190419_092406.jpg (255.35 KiB) Viewed 604 times
And the two parts fit together very nicely :)
IMG_20190419_092355.jpg
IMG_20190419_092355.jpg (197.03 KiB) Viewed 604 times
The top half still requires the vent holes and 'flash' to be cleaned up.

I know 'flash' is typically a term used for injection moulding, but it looks very similar to the brim of a 3d print.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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Re: 520ST PSU Remake

Post by rubber_jonnie » Fri Apr 19, 2019 9:35 am

PhilC wrote:
Fri Apr 19, 2019 9:29 am
Looks great RJ. How long dud it take to design it?
I'll be honest Phil, I can't take credit for the design, through discussions with various other people I was directed to it on Thingiverse, there is a link early on in the article.

It was designed specifically for the PSU I was using (or its variants), by someone replacing an Amiga PSU.

Thought it would be silly to try and reinvent the wheel.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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Icky
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Re: 520ST PSU Remake

Post by Icky » Fri Apr 19, 2019 9:36 am

:coolpics: Nice

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Re: 520ST PSU Remake

Post by PhilC » Fri Apr 19, 2019 9:38 am

Makes total sense to me RJ. And looks like it will clean up nicely.
If it ain't broke, test it to Destruction.

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Re: 520ST PSU Remake

Post by rubber_jonnie » Fri Apr 19, 2019 4:24 pm

Hmm, suspect my change to .3mm has had a side effect in that the top vents are really hard to clean the support structure out of.

Still, you live and learn, this is probably the largest most complex piece I've yet printed, so first go was always going to be a try out.

It is cleaning up ok, just taking longer than planned.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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rubber_jonnie
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Re: 520ST PSU Remake

Post by rubber_jonnie » Sat Apr 20, 2019 3:39 pm

OK, so it's finished and happily powering my 520ST 😁

IMG_20190420_152034.jpg
IMG_20190420_152034.jpg (305.65 KiB) Viewed 567 times
IMG_20190420_154511.jpg
IMG_20190420_154511.jpg (273.51 KiB) Viewed 566 times
IMG_20190420_154529.jpg
IMG_20190420_154529.jpg (213.15 KiB) Viewed 566 times
Project over, what would I say are the gotchas?

Well, in all honesty, the worst part was the top half of the case.

My decision to print @ .3mm bit me down the line, as the resolution was too poor to do a good job of the case vents, leading to a lot of filing and picking away support structures that simply weren't fine enough.

It's also possible that another material, such as ABS may be a better choice when printing.

What I gained in a faster print speed, I lost in tweaking the case to clear the air vents.

Other than that, it was a pretty simple process.

I hope this gives someone the confidence to have a go when they need to replace a PSU that is not a common item any more.

As an aside, this same PSU can be used to replace an Amiga unit, as was done by the original designer of the case itself.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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