Making a Small Mac From a Raspberry Pi 3

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Introduction: Making a Small Mac From a Raspberry Pi 3

About: Retired developer. Artist/Maker

In this Instructable we are making a slightly larger version of the Tiny Mac. There are a couple of reasons you might want to make this version.

  1. Supply chain issues (it is almost impossible get a Raspberry Pi Zero)
  2. A larger screen

This version uses a 3.5 inch display. This version's is about 25% bigger than the Tiny Mac and about 40% of the size of original Mac. I've also included a version of the case of the Pi Zero if you have one. Look at the Tiny Mac for Pi Zero specific instructions. Follow these instructions for the screen drivers.

I will refer to the original Instructable for much of the process. This Instructable will only cover the significant differences.

Supplies

Let's assemble what we need.

For The Raspberry Pi:

If doing the Pi Zero version, you will also need a mini HDMI to HDMI adaptor (for setup) and A small unpowered micro USB hub

In addition:

For The Case

Tools

Step 1: Let's Start With the Case

All the STLs should be oriented properly on the build plate.

I've attached the .stl files.

  • front_3.5.stl works with both the Raspberry Pi Zero version and the Pi 3 version of the build. Print with supports everywhere.
  • back_Pi3_3.5.stl is obviously just for the Pi3. The Pi 3 version does not have an externally accessible SD card. Print with supports from the build plate only.
  • fauxDriveFront_3.5.stl is for either version. Needed for the Pi 3, and used for the Zero version if don't add the SD card extension. No supports
  • retainerClip_Pi3_3.5.stl secures the Pi 3 in place. No supports.
  • back_PiZero_3.5.stl for the Zero only. Print with supports from the build plate only.
  • driveFront_PiZero_3.5.stl for the Zero only if you do the SD card extension. No supports.
  • driveBack_PiZero_3.5.stl for the Zero only if you do the SD card extension. No supports.
  • toggle_PiZero_3.5.stl holds the Pi Zero in place. No supports.

The pieces should be oriented correctly for printing. The back_supportTest.stl and the front_supportTest.stl files are there if you want to experiment with supports before committing to printing the full parts. I've included the SketchUp file if you want to make changes. Check out the original Insturctable Step 2 for more details about printing and finishing.

Step 2: Preparing the Case

Take a look at the instructions in the original Instructable Step 3.

A nut needs to be pressed into the front lip of the back of the case, a nut in the retainer or toggle. A nut pressed into the driveFront_PiZero_3.5, if using. For the fauxDriveFront_3.5, a hex nut gets pushed into the rectangular slot on the side with the disk tab. Pay attention to the orientation in the photo. Press it in place with an Allen wrench or a paler clip. The nut can be removed if need be by inserting a paper clip into the hole on the other side.

On the Pi 3 version of the case, you can use the retainer clip to hold the board in place. There are also places to use 4 - 2.5M X 10 cap screws and nuts. I'd recommend just using the retainer clip.

Step 3: The Faux Disk

This step is for the Pi 3 version or if you don't want to relocate the SD card on the Pi Zero version.

I placed the tape on a clean work surface and cut a strip 25mm (1") wide. I then carefully wrapped the tape over the disk insert, centering it. Using a utility knife I cut off the excess.

Place the chosen Faux Disk onto the case and slide it forward so that the end with the disk protrudes from the front. Attach from below with one of the 3M cap screws.

Step 4: Follow the Original

Step 5: Installing the Drivers for the Waveshare Display

Take a look at the Waveshare documentation. There is an explication of just what the need changes are. We are going to simplify them a bit.

Needed files:

  • the config.txt below
  • zip file from the Waveshare site. Decompress the zip file.

Take your Pi's SD card and insert it into your desktop computer. You have access to some of the files used on your Pi. At the root level you will find a file called config.txt. Make a copy of the file and rename it configOrg.txt. This is our backup in case something goes wrong. Drag your new config.txt file into the window. It will ask you if you want to replace the file. Go ahead. If you don't have rights, you and usually delete the file and add a new one. This file will tell the Pi to use the Waveshare screen as your default screen.

Looking at the root level, you will see a directory called overlays. Open that directory and drag in the 4 files from Waveshare's zip. waveshare-35dpi-4b.dtbo, waveshare-35dpi-3b.dtbo, waveshare-35dpi-3b-4b.dtbo and vc4-kms-DPI-35inch.dtbo

Eject your SD card and if building the Pi 3 version, insert it into your Tiny Mac. Otherwise hold on to it.

Step 6: Assembling the Tiny Mac

If you are using a Raspberry Pi Zero, follow Step 12: Assembling The Tiny Mac in the original instructable.

For those of you with the Pi 3, use the following steps.

With the SD card installed in your Pi 3, carefully install the ribbon cable as in the photographs. The Female connector attaches to the Pi, the Male end to the display. Note the cable's orientation. Make sure it is aligned and fully inserted.

Carefully insert the Pi into the back of the case. Check the ports are aligned to the openings. Slide in the retainer clip and screw it in from below. (If you decide to use the 2.5M nuts and bots, install the card first and then the ribbon cable.)

Remove the protective cover from the screen. Place the screen between the tabs on the front cover. The cable will point UPWARDS. Move the cover closer to the back, allowing gravity to hold it in place. Becareful of the cables. Slide it upward under the tab in the top cover. With the Small Mac held together, insert a 3M X 12mm cap screw into the remaining hole on the left. Tighten into place.

Insert the screw from below and carefully tighten. You don't want to push the nut out of its pocket.

Step 7: From Here On, Follow the Original Instructable

Follow the original Instructable steps and you should be good to go with your slightly larger Tiny Mac!

Step 14: Let's Boot It Up!

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    3 Comments

    0
    rob5
    rob5

    5 days ago

    Hi, I am in the middle of print all parts for the raspberry pi from, is this faux_drive_front missing from the stl files or is it not required?

    0
    cgenco
    cgenco

    Reply 5 days ago

    I'm so sorry. It's up there now.

    0
    erikhoffman
    erikhoffman

    13 days ago

    Very nice, wonder if you can 3D a mini old Apple keyboard and mouse to complete the kit
    Regards
    Erik Hoffman