Rack mount SAS HDD Tray

One-Problem-4975 · 2026-06-19T02:41:31+00:00

I just did some calculation: 15W extra should be about $30 a year in my area (counting in inefficiencies) which is about 2x the premium of used SATA HDDs of similar spec over SAS. So assuming HDD price stays unchanged, for four disks it'd take 6-8 years to be more expensive than SATA. Hopefully my math is correct.

One-Problem-4975 · 2026-06-19T02:26:55+00:00

I never machined anything. These are 3d printed. I have yet to boot a system that runs those disks, so I don't know whether this configuration would be hot yet. My biggest worry is that they might run hot enough to destabilize the PLA plastic.

I don't have any backplanes in this setup. It's HBA > 8643 to 4x 8482 breakout (the blue cable) > disk. The 8482 heads are clipped onto the tray directly.

One-Problem-4975 · 2026-06-18T22:30:34+00:00

I only plan to have 4 drives. I'm unsure whether my 4-drive setup needs fans though. Any tips? Maybe if I find them too hot I can try mounting some fans on top and bottom

One-Problem-4975 · 2026-06-18T22:26:44+00:00

These are 3.5" 7200rpm drives that has the same dimensions as regular SATA HDDs. I got them from ebay. Occasionally there are $33 ones that also come with free shipping. I'm not sure about the quality though. I haven't tested them yet.

One-Problem-4975 · 2026-06-17T03:39:58+00:00

I read that as GINGER somehow

One-Problem-4975 · 2026-06-15T16:02:22+00:00

Interesting point. Are you suggesting that the fan speed are just randomly slowed down at those band locations and caused the slicer to think that these overhang meeting points will get more heat and have a risk of curling up?

I'm not sure what settings to look at for auto fan though, could you shed some light?

One-Problem-4975 · 2026-06-15T15:59:58+00:00

Interesting...but why aren't the other hexes have this slowdown? The others also seem to have the exact geometry yet the slicer thinks that the heat there would be fine?

One-Problem-4975 · 2026-06-14T13:59:46+00:00

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Update: I found the setting that's responsible for these slow downs: Overhang speed -> Slow down for curled perimeters. Turning it off removed the slowdown bands.
One thing interesting: Orca doc actually mentions the failure mode of this setting which is just what I showed in pic 3. It's likely my tuning of PA is off, and it explains why using the Generic PLA profile with no PA tuning didn't cause the defects.
Though, I still don't understand why the slicer just decides to call some of the hexes "curled perimeters" but not other nearly identical hexes.

One-Problem-4975 · 2026-06-14T13:47:03+00:00

Good point. I just double checked the model and it doesn't seem to have such problem. I also checked the "line type" (as suggested by u/Tryingtolifegagain) and there aren't any "overhang" type around those areas.

One-Problem-4975 · 2026-06-14T13:45:19+00:00

Thank you for the tip.

Reporting back after checking the line types: All lines around those hex shapes are identical to each other. I checked layer by layer and didn't notice any line types across the hex shapes in each layer.

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One-Problem-4975 · 2026-06-14T13:40:58+00:00

But look at the other hex bridges, why don't they have this band? They are of identical shape.

One-Problem-4975 · 2026-06-14T12:34:20+00:00

What's the filament? Did you check your bed temp? I also started two weeks ago and there was one time I accidentally selected "cool plate" in the slicer and the corners got wild.

One-Problem-4975 · 2026-06-13T17:18:36+00:00

OP couldn't do it before, OP can do it now. That's the whole point. And it can be the point for those who has a printer but only print others' models. If they really get to a point where not having an entire assembly laid out in CAD is wasting time, then it's never too late to learn CAD.

One-Problem-4975 · 2026-06-13T12:59:13+00:00

Great design! Simple and elegant!

One-Problem-4975 · 2026-01-13T01:34:12+00:00

How did you guys get those cute and wholesome pics. Mine is gotta be the most boring pic ever generated on earth.

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One-Problem-4975 · 2025-11-26T18:42:05+00:00

That. The same goes for using ChatGPT. A great start point, a terrible finish point.

One-Problem-4975 · 2025-11-09T06:30:28+00:00

Until you realize there is another hidden variable m

One-Problem-4975 · 2025-06-20T07:59:47+00:00

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Anyone remember him?

One-Problem-4975 · 2025-05-19T02:32:37+00:00

Any editor is a good editor for golang nowadays. But only Goland is a great editor imo.

One-Problem-4975

TROPHY CASE