10inch rack 2U 12-bay 2.5" disk shelf (WIP)

WIP - DISCLAIMER - WIP

This is a work-in-progress, parts of this are unfinished, parts are currently missing, tolerances & clearances are still being worked on so parts might not fit together properly. Part orientation is not correct in the STLs, they will all need rotating in your slicer.

I have a TecMojo 9U 10inch rack (200mm deep). This is designed to fit into this rack. It should fit into any 10inch rack, but I cannot guarantee this. If it doesn't fit please let me know and I will work on adjusting the dimensions.

WIP - DISCLAIMER - WIP

-- UPDATE 21-09-2026 --

Apologies for not updating this for nearly a year. Life kinda got in the way, 3D printer died, and with some other stuff going on I lost interest in finishing it.

I ordered lenovo and a fijutsu SAS backplanes from AliExpress. Neither was suitable due to dimensions and drive spacing. So I pivoted to a bracket system that supports SAS-Sata adapters like these: 

https://www.aliexpress.com/item/1005009881634827.html?spm=a2g0o.productlist.main.54.73dc278aNYo1Xt&algo_pvid=c416a157-f774-46ac-8a43-cb3b6b8c987d&algo_exp_id=c416a157-f774-46ac-8a43-cb3b6b8c987d-53&pdp_ext_f=%7B%22order%22%3A%2257%22%2C%22eval%22%3A%221%22%2C%22fromPage%22%3A%22search%22%7D&pdp_npi=6%40dis%21GBP%213.69%213.69%21%21%2132.12%2132.12%21%4021613be817900278235503151e0ea3%2112000050464092735%21sea%21UK%213585763310%21X%211%210%21n_tag%3A-29919%3Bd%3A1198fa34%3Bm03_new_user%3A-29895&curPageLogUid=7uuOeRCcO7n2&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005009881634827%7C_p_origin_prod%3A

The bracket is a top & bottom piece, and 12 "blades" 1 per drive / adapter. These are now in the files.

For data connection I've was using a 9400-16i HBA, and can confirm these do work with SAS drives. For power I've was using a flex atx psu with a custom wiring harness.

Finally, I've also uploaded a .stp file containing the entire model, drive cages, blanks, sas adapter bracket, and back plate. Feel free to modify the design, but please link back here as the original.

I've also designed a new version that supports 3x 3.5" Drives, and 5x 2.5" Drives. The new version is a complete re-design and the only compatible parts from this design are the rack ears. I plan on having that one posted soon. The new version also includes a "power shelf" that has space for a flex-atx psu and oculink to pcie adapter board for the HBA. The idea being a 3u DAS solution for any pc with an oculink port.

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-- UPDATE 27-12-2025 --

Print orientation has been fixed on all parts. The STLs should now be in the correct orientation when imported into your slicer. 

Tweaked the caddy design for better fitment.

Added "Blank" caddys, both vented and non-vented, to fill any gaps you don't want to put drives in.

Added blank label. Should be a push fit into any of the vent slots on the front of the caddys. If it doesn't fit, shrink in your slicer by 1-2%. More sizes, numbered, and larger labels are also in the works.

Still waiting on the backplanes and sas-sata adapters to finalise the design of the midplane. Hopefully will be uploaded around new years.

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This is something I've been working on for a little while for my minilab 10" rack. I have a bunch of 2.5" disks and wanted a disk shelf so I could make use of them.

This is a 2U, 12-bay, 2.5" hot-swap (potentially) disk shelf. Each caddy is designed for a disk up-to 15mm thick. Each "bay" is 17mm wide to make sure, even with 15mm disks, there is still space for air-flow. The rear panel has mounting points for 3x 60mm fans, and a large cable cutout. The caddys have 2 nubs and 2 screw holes for securing the disks, and latch into the shelf to keep the disks securely mounted.

I designed this with separate rack ears so it's printable on any printer with a 220mm X 220mm bed or bigger, and the entire things is designed to go together with M3x6 countersunk screws (solely because I have a few thousand on hand).

It's mountable either way up so you can have the disk release latches on the top or bottom, and the back panel can also be attached either way up so you can get the cable cutout in the best position.

Printing:

I've been printing my test prints in PETG using 3 walls, 3 top / bottom layers, and 20% infill and so far and everything seems to be holding up well.

• The disk shelf itself

  • Place with the "Front" (the end with the rack-ear mounting holes) on the build plate

  • Support optional (can help keep the screw holes round) 

• 2x rack ears (2 more can be mounted to the rear posts for extra support if needed, these do not attach to the disk shelf, only the rack posts)

  • Place the "Front" (where the holes for the rack screws are) on the build plate

  • Support optional (can help keep the screw holes round) 

• 1x back panel

  • Place with the "Inside" side on the build plate. The chamfer on the screw holes should be facing up

  • No support

• 12x drive caddys

  • Place with the "Bottom" (the side with lip for the drives to sit on) on the build plate

  • Support optional (helps with the ventalation holes in the front)

The missing / WIP bits:

• There are 4 holes on the top & bottom of the disk shelf, these are for mounting a mid-plate to hold either a backplane or 12x sas-adapters allowing the disks to be hot-swap. I'm currently waiting on a few different backplanes and sas-adapters to arrive, and will update and add mid-plate designed once I've been able to measure these and design something suitable.

• Drive label peices designed to clip into the vent-holes on the front of each caddy. Planning on blank for stickers, and ones with 1-12 imprinted on them.

• Planning on some changes to the back-panel and other parts to add some cable management features (holes for zip-ties, etc.)

• Extra back-panel designs for other fan sizes (70mm, 80mm)

• A version with integrated rack-ears for larger printers (250mm X 250mm beds)

• Pictures will be added once I've re-printed a couple of caddys and had a chance to take some

• Fix the orientation in the STL files to simplify printing

• Tolerances & clearances between parts, as written above in the disclaimer, are still being worked on. Most parts are designed with 0.1-0.25mm clearance between sides. On my printer this is enough space for a smooth fit, but if the tolerances are too loose / tight I can adjust and upload modified parts.

I will be adding the .STEP / .OBJ / .F3D files once I've fixed a few other bits and fixed some wonky internal geometry that makes modifying the designs awkward.