A 12 bay 2.5 in drive cage that fits the Chenbro RM42300 4U chassis. Mounting holes on front for a standard 92mm fan like, https://a.co/d/f01yJng. Accepts four rubber grommets from the drive cage for a friction fit to the chassis mounting posts. If damaged, replace them with a 3/8 in rubber grommet, like https://a.co/d/0UNd2Hk.

While I do not expect the drives to get very hot I recommend printing with a high temp filament like PETG or ABS to be on the safe side. I printed mine in PETG with no supports oriented with the fan side up, this produced good results.

Source available at onshape.com: https://cad.onshape.com/documents/2c1aac796798f6f7f7aba8ed/w/a9cf0902bf4bf54183c64da2/e/4f1f4da96c1f4c26d83491c6

Change Log v2:

• Removed retaining lip since it was not working
• Reduced the tolerance on the drive slots for a friction fit
• Removed the two vertical drive slots, reducing total capacity from 14 to 12 drives
• Moved the fan mounting plane back to accommodate a standard thickness fan and allow for greater clearance of the front IO connections
• Extended the outer shell forward to create a shroud around the fan in hopes of reducing recirculation of hot air
• Reduced depth of drive slots by 5mm to make it easier to grab hold of a drive and avoid interference with SATA cables
• Increased tolerance on bottom mounting holes to prevent tearing the rubber grommets
• Changed access to fan holes from open vent to a clearance hole to help make screw alignment easier
• Added ledges at fan corners to make alignment with screw holes easier