It press fits together to toss in your pocket, then pulls apart to brace your phone in landscape mode.
I also added a channel in the bottom to feed your USB cable through if desired.

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Thingiverse Files to print your own.

• 5v Relay - SRD-05VDC-SL-C
• Dupont Connectors
• Dupont Crimps (to correctly crimp down the connectors to your wire)
• 22/4 shielded wire (There are better options and we only need 3 wires, this is just what I had on hand)
• M3*12mm Bolts and Nuts

• Ender 3 Cable clip
• Single relay mount
• M3 2020 T-Nuts

https://www.youtube.com/watch?v=0-Ol6Yvf0fg

I'm starting to look into controlling the power of my Ender 3 3D printer from my Raspberry Pi running OctoPrint. I was able to locate the PSU Control plugin for OctoPrint, so I think this is the route I am going to go.

PSU Control on GitHub

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This plugin is also available via the OctoPrint plugin manager.

Next I picked up some relays to allow the Pi to control power via the GPIO pins on the Pi.

Relay

I have modified a Relay mount to include some M3 style tabs so you can bolt the relay to the frame of your printer with T-Nuts.

Thingiverse Relay mount

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The basics 

I cut the 24volt Hot line coming from the PSU and placed the Relay between the PSU and Printers mainboard. This will allow me to keep my Octoprint Raspberry Pi on while turning the printer off and on via the OctoPrint web portal.
I have it set up this was, as my Raspberry Pi setup is powered off the Printer PSU.

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The red wire is cut from this connection (coming from the printer) and the relay is connected with the 2 ends of the red wire.
The Normally Open and Closed (center location) terminals are used. Normally Open means the circuit will be Open by default, thus the Printer gets NO power. A signal from the Raspberry Pi is required to trip the relay and close the circuit, powering on the Printer.

You can use Normally Closed if you wish, this would mean the Printer always gets power by default and a signal from the Raspberry Pi is required to power OFF the printer.

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The relay also has 3 pins located on the other side. These are for 5v power, ground and control signal all coming from the Raspberry Pi. I used a 4 conductor shielded cable to run power from the Raspberry Pi from the front of my printer, back to the relay in the rear under the bed.

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I crimped on Dupont connections to each wire and hooked them up to the relay. In my case Yellow is the signal wire from the Raspberry Pi GPIO pins, Red is 5V from the Raspberry Pi and Black is Ground from the Raspberry Pi.

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I connected my wires to the rear of the Raspberry Pi, but you can use the top pins if you wish, shown below.

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Once everything is wired up, you can then download PSU Control from the OctoPrint Plugin Manager.

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After the installation of PSU Control, you can reboot OctoPrint and configure the settings.

This is my current setup, be sure to set the GPIO Mode to BCM, and set your pin to 21 to match our setup, the remaining settings can be configured to your liking and a full write up of the options can be found on the OctoPrint PSU Control Site

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Once everything is done, there will be a Lightning bolt icon in the Top Right of your OctoPrint UI, Click this to control the power of your Printer!

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3D Printing Hacks

A guide for beginners and general tips and tricks.

https://www.instructables.com/id/3D-Printing-Hacks/

Using an XBOX Kinnect to scan 3D Models

Do you have a spare XBOX Kinnect sitting around? Want to use free software on your MAC or PC to make 3D scans and export them to STL files?

https://www.instructables.com/id/Easy-3D-Scanning-for-3D-Printing-Mac-PC-At-Techsho/

7 Free STL File editors

Want to modify your STL files? Check out these 7 free great options!

https://all3dp.com/1/7-free-stl-editors-edit-repair-stl-files/

3D Printing from Sketchup

The tool I currently use to design my 3D files, Google Sketchup

https://www.youtube.com/watch?v=RPQliNKJKto

Finishing your 3D prints

Smoothing, marbling and coloring... Multiple processes for finishing up your 3D prints

https://all3dp.com/enhance-3d-prints-with-water-marbling-other-tricks/

3D Printing Troubleshooting Guide: Pillowing

https://www.youtube.com/watch?v=51SXWKh9iSA

My Thingiverse Profile

Also, I am using the following hardware

• Raspberry Pi 3 B+
• 24v to 5v DC Buck converter
• Noctua 40mm cooling fan
• Raspberry Pi camera (mine is v1.3, soon to upgrade)
• 610mm Raspberry Pi camera ribbon cable
• 3.5inch 320x480 Touch Screen LCD
• 3D Printed Enclosure for Pi and TouchSreen
• Left angle 12 inch Mini USB to USB
• MicroSD to SD card adapter

First, we need to download OctoPi and create a MicroSD image from their downloads.

https://octoprint.org/download/

Once you have the most recent version of OctoPi downloaded and ready, insert the MicroSD card you will be using into your computer and upload the image to it.

A popular and simple tool to do so is Etcher.

https://www.balena.io/etcher/

Below is taken from the OctoPrint.org/download guide, under the Getting Started with OctoPi.

Please follow these steps after downloading

1. Unzip the image and install the contained .img file to an SD card like any other Raspberry Pi image.

2. Configure your WiFi connection by editing octopi-wpa-supplicant.txt on the root of the flashed card when using it like a thumb drive. Important: Do not use WordPad (Windows) or TextEdit (MacOS X)for this, those editors are known to mangle the file, making configuration fail. Use something like Notepad++, Atom or VSCode instead or at the very least heed the warnings in the file.
   
   Note: This changed with OctoPi 0.15.0, earlier versions had you edit octopi-network.txt which has a different format. This old method is no longer supported and the contents of this file will be ignored. Just use octopi-wpa-supplicant.txt.
   
   Please also refer take a look at the full WiFi setup guide in the FAQ that also includes Troubleshooting tips.

3. Boot the Pi from the card.

4. Log into your Pi via SSH (it is located at octopi.local if your computer supports bonjour or the IP address assigned by your router), default username is “pi”, default password is “raspberry”. Change the password using the passwd command. You do not need to expand the filesystem, current versions of OctoPi do this automatically.

5. Access OctoPrint through http://octopi.local or http://<your pi's ip address>. https is available too, with a self-signed certificate.

Please also refer to OctoPi’s README, especially the “How to use it” section.

Once your Raspberry Pi is booted and you are able to SSH into your device, we can now start to configure the touch screen, and other software.

To SSH or connect to your device, first be sure to complete the WiFi setup above, or connect with an ethernet cable into your Raspberry Pi.
You can then use Putty as an SSH client to connect to the Raspberry Pi / OctoPi installation.
The name you will connect to is octopi.local

First lets run some updates to get everything ready.

sudo apt-get update
sudo apt update
sudo apt dist-upgrade
sudo apt clean
sudo reboot

We also need to setup autologin, to do so run

sudo raspi-config

And navigate to Boot Options - Desktop CLI - and choose Console Auto Login

For my specific LCD, I was able to locate the manual and other details here

http://www.waveshare.com/wiki/3.5inch_RPi_LCD_(A)

You can download and install the files with the following

git clone https://github.com/waveshare/LCD-show.git

cd LCD-show/

sudo chmod +x LCD35-show

sudo ./LCD35-show

The device will reboot, once it's booted we can log back in and continue.

Next we can rotate the display with the following command.

cd LCD-Show
sudo ./LCD35-show 270

Reboot your Raspberry Pi and make sure you get video on your LCD.

If your screen is not rotated correctly with the above command, do the following.

sudo nano /boot/config.txt

And change the line for your display to add :rotate=270 as shown below

dtoverlay=waveshare35a:rotate=270

Now that we have our LCD functional and working, lets install a user interface.

First is the X desktop environment, then Touch-TFT and its requirements

https://github.com/mcuadros/OctoPrint-TFT

sudo apt-get install libgtk-3-0

sudo apt install xserver-xorg xinit xserver-xorg-video-fbdev

Once X is installed, we can follow up with the installation of OctoPrint-TFT

wget https://github.com/mcuadros/OctoPrint-TFT/releases/download/v0.1.2/octoprint-tft_0.1.2-1.stretch_armhf.deb
sudo dpkg -i octoprint-tft_0.1.2-1.stretch_armhf.deb

sudo systemctl set-default graphical.target

Lastly we need to remove the 99-fbturbo.conf file from our Xorg directory.

sudo mv /usr/share/X11/xorg.conf.d/99-fbturbo.conf /usr/share/X11/xorg.conf.d/99-fbturbo.conf.old

Now on reboot OctoPrint-TFT should load and start attempting to connect

Next we can enable the Raspberry Pi camera, to do so get into the raspi config menu;

sudo raspi-config

Navigate to option 5 Interfacing Options, and enable the Camera under option 1.

I also like to disable the camera LED, this can be done with the following;

sudo nano /boot/config.txt

and add the following line

disable_camera_led=1

On next reboot the camera LED will be disabled.

I also modified my Raspberry Pi to connect to a network share housing gcode files for my printer, to do so I did the following.

sudo nano /etc/fstab

And added the following line (modify for your network and setup)

//server/share/Data/3D/gcode /home/pi/.octoprint/uploads/_network cifs username=pi,password=raspberry,domain=workgroup 0 0

//server will be the computer your network share is located and /share is the shared folder.

Some users have reported having to specify their cifs version for this to work correctly.
I've also noted, uploading files to the shared folder requires a refresh of the WebUI of OctoPrint for them to display in the file menu if you have navigated to it in your current session.

Upon reboot, it will mount my network share from \\Server\share to the Ocotprint Uploads folder on my Raspberry Pi.