September 6, 2025
Description
Accidentally, I uploaded the modules without the supports, now fixed, please download them again if there are no support parts in your 3MF.
This is a 2U mounting frame for 19" racks inspired by @Mauker's rack mounts. (Should be compatible with them, so you can mix and match). While those models are really useful, I am running out of space in my small rack and would like to mount multiple different devices, thus none of them are a perfect match for me, hence this idea and model.
Looking for a 10 inch version?
The frame has 14 x 15mm slots on each side (totaling in 28) which can be populated with different modules, like Raspberry PI mount, JetKVM mount, other custom mounts and modules.
The frame is designed to accept M3 heatset inserts and the modules can be mounted using M3 bolts, however friction fit seems to work just fine too. I opted to keep the holes for the heatset inserts and bolts, but use only friction fit.
All models have supports designed in, open it as a model with multiple components. There should be no need for additional supports once oriented correctly. (Print the frame face down, and the modules on their side.) The supports should be easy to remove when done.
The links to specific hardwer I mention in the description are Amazon.de affiliate links. Click them if you want to support me when purchasing them.
This is an experimental model, check back for updates later.
This page will contain a few sample modules, others might be posted as individual models in the future, check the remixes!
Once the design is final-final, step files for the samples and the frame will be shared.
Each side can in theory have 7 Raspberry PIs (so 14 in total). This can lead to significant heat, I recommend to add a fan tray below or above the frame, like https://www.printables.com/model/1371113-120mm-fan-modular-mount-for-19-inch-rack
I printed the frame in Prusament PETG-CF, proved to be strong enough so far. Be careful with the material choice, racks can be toasty, not all materials will like the environment. Know your material and your situation in the rack.
These modules are designed for RaspberryPIs (surprise, I know). I tested them with RPI 4B and RPI 5.
The RPIs are facing backwards (the USB-A and RJ45 connectors are facing the inside of the rack) because in most cases when something is mounted in a rack, they are not accessed very frequently and having all the cables inside the rack makes cable management a bit easier (at least in my humble opinion). The backward facing ports also makes it possible to have 40x40 fan(s) mounted on the front facing side (3 slot wide and wider).
I highly recommend POE hats and a decent POE switch to power them, most POE hats have at least one 5V output where a fan can be hooked up. (Some also have 12V and 3.3V and/or 5V with PWM). Noctua's A4x10 and A4x20 fans are quite even when they are not controlled by PWM and they have both 12V and 5V versions, some are boundled with a 2 pin adapter or USB adapter. You know: RTFM :)
In a high-density configuration (7 RPIs in 2S modules with low profile POE hat), I recommend adding a fan mount above or below the MRM frame with bigger fans blowing on all RPIs.
The GeeekPi P33 M.2 NVME M-Key PoE+ Hat for Raspberry Pi 5 has a non-pwm 3.3V, 5V and 12V set of pins and with the RPI5 and it's official cooler (comes with the hat) fits perfectly in the 3 slot module.
License:
Creative Commons — Attribution — Noncommercial
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