I was unable to find a product that met my specifications of 8 hot-swap bays, a SAS backplane and external SAS connectors for easy connectivity, so I decided to design and build my own 8-bay Direct Attached Storage (DAS). This DAS features a Supermicro SAS833TQ backplane with Gen 5.5 hot-swap 3.5" trays. It is powered by either a 200W PWS-203-1H (as-shown) or a 350W PWS-351-1H (or similar units of the same dimensions: PWS-351-1H 100 x 40 x 220mm, PWS-203-1H 76 x 40.3 x 192mm) power supply. Additionally, it includes an external SAS SFF-8088 to SFF-8087 adapter to cut down on internal wires.

I printed this on my X1C and have realized that making it available for smaller print beds should also be done instead of 1 large single print.

The body is 255 W x 190 H x 245mm D, it is printed as a single print, no supports needed. The body at 10% infill, 2 walls with gyroid infill .20mm layer height with a 0.4mm nozzle. This print requires NO supports to print. The print of the body will use approximately 984.5g of filament if no painting is done of the logo or numbers, and 982.6g if painted of a single color. This print took roughly 20 hours to print. I realize this might also be a turn off being a large print but I wasn't wanting to have to glue or screw it together if I could help it. If you are wanting this, let me know and I can work it into a new version. There are 2 version of the back plate for the different sizes of PSUs mentioned.

Here is the list of parts used for this build:

Supermicro Gen 5.5 3.5" trays (MCP-220-00075-0B) x8 ~$50 for 8 on eBay
Supermicro SAS833TQ 8-bay SAS backplane ~$35 on eBay
SFF-8087 to SATA breakout cable x2 ~$16 https://a.co/d/efNZnns
SFF-8088 to SFF-8087 adapter ~$30 https://a.co/d/c2u3VQA
Supermicro 1U PSU of dimensions 100 x 40 x 220mm or 76 x 40.3 x 192mm (As seen PWS-203-1H ~32$ on eBay, also designed screw hole for PWS-351-1H ~$30 on eBay)
Molex Y-cable ~$6 https://a.co/d/cKoZu7M
120mm of your choice x2 (Noctua NF-P12 shown) ~$16 ea. https://a.co/d/45AMhLL
ATX power jumper cable w/ switch ~$11 https://a.co/d/5w77CnE (this required a tool to remove the pins from the connector to feed it through the hole ~$17 https://a.co/d/iTMzX6b , you don't have to get one like this, but I wanted the other pin extractors for future projects.)

Grand Total of parts: $210, could save $32 with some random 120mm fans as long as they can pull through all the trays.

For hardware needed:
M3*4*5 Heatset inserts x7
M4*6*6 Heatset inserts x6
M3*6 socket head screw x3
M3*12 socket head screw x4
M4*8 socket head screw x6

Some optional parts that might be desired:
120mm wire fan grills ~$8 https://a.co/d/ieKCltI

Some rubber feet for the bottom