First post, by mkarcher
As I recently obtained a Compaq SMART RAID controller (which has contact issues on the controller firmware ROMs and likely dead backup batteries, but seems to basically work otherwise), I want to install more than one drive into my Compaq ProSignia (aka ProSignia 3080) system, but while obtaining SCSI drives isn't that hard, you don't get them with the original Compaq Rails to insert them into the bays. So I took measurements on the one pair I got, and designed a 3D model of them to be printed on standard FDM printers. I verified that the rails printed from standard PLA work perfectly as replacement.
The original rails are desinged for special screws that have a wider cylindrical area before the start of the head. The holes in the Compaq rails are designed to accomodate that wider cylinder. The design on thingiverse on the other hand is meant for a UNC#6 thread reaching up to the head of the screw, so the hole is intentionally smaller to provide a thight fit with the thread. In case you want bigger holes for the original Compaq screws, you can generate a variant of the OpenSCAD file which sets holediameter to cpqholediameter instead of 3.7 (mm), and re-export STL or process it in any other way you require for production.
The model is published on thingiverse at https://www.thingiverse.com/thing:6136025
