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3U Hard Drive Bay for 8x 3.5in HDDs for 10" Mini Rack 3D Printer File Image 1
3U Hard Drive Bay for 8x 3.5in HDDs for 10" Mini Rack 3D Printer File Image 2
3U Hard Drive Bay for 8x 3.5in HDDs for 10" Mini Rack 3D Printer File Image 3
3U Hard Drive Bay for 8x 3.5in HDDs for 10" Mini Rack 3D Printer File Image 4
3U Hard Drive Bay for 8x 3.5in HDDs for 10" Mini Rack 3D Printer File Image 5
3U Hard Drive Bay for 8x 3.5in HDDs for 10" Mini Rack 3D Printer File Thumbnail 1
3U Hard Drive Bay for 8x 3.5in HDDs for 10" Mini Rack 3D Printer File Thumbnail 2
3U Hard Drive Bay for 8x 3.5in HDDs for 10" Mini Rack 3D Printer File Thumbnail 3
3U Hard Drive Bay for 8x 3.5in HDDs for 10" Mini Rack 3D Printer File Thumbnail 4
3U Hard Drive Bay for 8x 3.5in HDDs for 10" Mini Rack 3D Printer File Thumbnail 5

3U Hard Drive Bay for 8x 3.5in HDDs for 10" Mini Rack

RagingRoosevelt avatarRagingRoosevelt

February 18, 2026

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DescriptionCommentsTags

Description

BOM

Part

Qty

Image

M4 Heatset

  • src 1

  • src 2

12

M3 Heatset

  • src 1

  • src 2

8

M4x5mm
(BHCS preferred)

7

 

M4x10mm
(BHCS or SHCS)

5

 

M3x10mm
(BHCS preferred)

8

 

Jonsbo N3 Backplane

  • src 1 (verified)

  • src 2

  • src 3

  • src 4

I also designed a 7-drive version that doesn't use a backplane

1

40x40x20 Case Fans

  • src 1

  • src 2

4

3 Pin Fan Splitters

2

 

Coolermaster Drive Sleds

  • src 1 (verified)

  • src 2

  • src 3

or printed parts (in files list)

  • src 1 (you are here)

  • src 2 (labman)

As needed

Printing

So far PLA is working fine but I'll update if I run into problems.  PETG would be great.

I printed with 6 walls and 15% cubic infill and that seems plenty strong.  

Neither part should require supports.  Orient the drive mount with the rack ears on the build plate.  Orient the backplane mount with the rebate for the fans and backplane facing up.

Assembly

Step

Photo

Uses:

  • 5 of M4 heatset

Install the heatset inserts into the drive mount printed part.

Uses:

  • 7 of M4 heatset

Install heatset inserts into the backplane mount printed part where the backplane will go.

Uses

  • 8 of M3 heatset

Install heatset inserts in diagonal pairs in the bolt holes of your fans, on the side of the fan that doesn't have a grill.

Uses:

  • 7 of M4x5mm

Bolt the backplane to the backplane mount.

Feed the fan wires through the fan cutouts then slide the fans into the fan cutouts.  Make sure that the fan wires end up in the rectangular part of the cutout. 

Uses:

  • 8 of M3x10mm

 Bolt the fans into position through the backplane mount and into the fans.

Uses:

  • Small zip ties

Zip tie the pairs of fan wires using the zip tie pockets.

Uses

  • 5 of M4x10mm

Bolt the backplane mount onto the back of the drive mount.

 

Install the bay into your mini rack.

 

Wire up your drive bay

 

 

 

 

License:

Creative Commons — Attribution — Share Alike

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