Reddit mentions of 1 Piece DIN Rail Slotted Aluminum RoHS 12" Inches Long 35mm Wide 7.5mm High

https://blog.wwolf.us/din-mounting-for-the-pi/

This is not necessarily an exciting write-up. My main purpose is to show how easy this is and offer it as an alternative to typical cases and power supplies. Earlier in A cluster of Pi’s, I referenced DIN mounting for the Pi. DIN rails along with the POE hat would reduce the space required, cord clutter, and possibly increase cooling. It has begun…

DIN rails – Backing up

DIN rails have many applications and are commonly found in telecom and industrial environments. Other than my current use, I have used DIN rails in a fulfillment warehouse where we used DIN rails to mount all the various power supplies, breakers, switches and PLC controllers for the conveyor systems.

In a previous post here, I describe my server rack. As much as I would like to house everything inside this rack, it is quickly becoming full and I have more plans down the road for servers and UPS systems. Whereas this could be a great excuse to purchase a second rack, there is simply not enough room. This makes the use of DIN rails even more practical for me as I can easily allocate some wall space for mounting and just route the necessary Ethernet cables to the Pi’s.

DIN mounting parts list:

• Pi 4 (4GB) – I am currently only acquiring Pi 4 4GB models but any that accept a POE Hat should work for this. I have some Pi 3’s and an O-droid that may migrate to this system later.
  
• POE Hat – My first purchase of the Official POE Hat and already very impressed. I have used one from Pi Supply that worked for a little while then suddenly stopped but I have not attempted to troubleshoot.
  
• SD Card – These are my current favorites but any 8GB+ should suffice.
  
• DIN rail – I ordered a small section for now and can easily expand later.
  
• DIN rail mounts – Until I figure out my 3D printer (or replace it) these seemed like the best solution to get going quickly. Also, I like these as the mount the Pi perpendicular to the rail as opposed to parallel. This consumes much less of the rail and opens more space for Pi’s!
  
• POE capable switch – I already had a switch capable but any should work for this. Be sure to calculate your needs, 15W per Pi, and plan accordingly.
  
• Cat-6 Ethernet cables – For the price, just go with Cat-6. Cat-5 should work fine if you already have it lying around.
  
• 8 or 9mm standoffs – The POE Hat comes with Female/Female 9mm standoffs but we need Male/Female. I only have 8mm and 10mm so went with 8mm.