Do you have a 3D printer?
this post was submitted on 12 Feb 2026
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Yes i do, its not the greatest but it gets the job done.
Check out https://docs-os.mainsail.xyz/
If you have a 3D printer where you just take an SD card out, put it in the computer, put your STLs on, put it back in the machine, then print.... You'll like this. I have my Pi set up with MainsailOS and what it does is basically control your printer. It even integrates into my slicer so I just slice my file then hit print and it starts immediately over WiFi.
If your printer is WiFi connected already this may be less useful but Klipper is pretty powerful for tuning and stuff so it's still a benefit.
Edit: Pi5 may not be supported by MainsailOS but you can set everything up in a more manual way. It's not too hard. https://youtu.be/LImiFmhMAB0
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Folding@Home
Distributed computing project that allows you to contribute CPU cycles to scientists searching for cures for things like Alzheimer’s and cancer.
If the pi ends up with a flavor of Linux:tux:, don't forget the ZRAM compression.
On my debian I use default settings and end up with nearly double available memory.
It also reduces disk usage by giving ZRAM priority over swap.
The rp5 could be a:
Luanti/VoxelLibre server
Kiwix Wikipedia server
Pi-hole of course.
My rp4 can run the three just fine.
Could try something like home assistant
(Rp4 is just a little underpowered but can function)
Could also turn it into a NAS.
ZRAM works magic even on my pi 3. It should be the first thing anyone doing something nontrivial turns on.
I have one pulling double duty as a Pi hole and emulation console.
Website
Step one, put it in my hand.
Step two, take this $3.50 in all pennies. Those are valuable. They fon't even make those pennies anymore, and thats 350 of them! All for you! Honestly, you're making out on this deal.
Step three, ..........
as heard in the distance
.......sucker!!!
You could host your own federated instances.
Pipboy
Connect an Adafruit BNO055 and an Adafruit PCA9685 to it, find some cheap servos, and build a robot you can control over wifi.
Look at selfhosting apps. Pihole is popular since it has some immediate benefits for other devices in your network. HomeAssistant is amazing if you're into automation. But there's hundreds of cool selfhosted apps that can improve your life depending on your interests. Getting familia with Docker will open up a lot of doors for easily launching servers hosted on the pi. What are your hobbies?
Moode audio streaming server / player