Category Archives: Featured

This category is for featured articles that we want to include in the sidebars and other areas on our website.

3D Printing a Raspberry Pi Case

In a previous article, I wrote about jumping into 3D printing for fun and home-brewing.  I decided I wanted to try printing a custom case for my Raspberry Pi 2 Model B that I found on Thingiverse.  I chose one that had VESA mounting tabs with 75mm spacing in order to mount to the back of an older LCD monitor I had laying around.  I am doing this to create a dedicated computer for running my M3D 3D printer.

Raspberry Pi Case
Custom Cases for Raspberry Pi found on Thingiverse.com

I’m printing the case you see above on the left.  There are other upper case options for mounting mini-fans should you need to provide extra cooling for your Raspberry Pi.  And if you are handy with one of the many 3D modeling software packages out there, you can mod this case (or any case) to fit your specific needs.

PRINTING THE CASE LOWER

I acquired a spool of black PLA filament (Hatchbox) from Amazon.

3D Printer Filament

While not specifically branded by M3D, I wanted to try other sources because the Hatchbox brand was less expensive on the order of 2.8:1 than the M3D branded filament.  I was taking a chance because I am learning that getting the temperature right for a brand not tested by the printer manufacturer can be tricky.  I did have issues of the print starting to lift off the print bed (M3D is non-heated).  But I recovered from that by tacking down the corner with a hot glue gun.  Maybe this would have printed better on a heated print bed or if I would have controlled the surrounding temperature better.

Almost completed lower Raspberry Pi cas
Almost completed lower Raspberry Pi case
Completed Raspberry Pi case lower
Completed Raspberry Pi case lower

 

Back of case showing "raft" before removal and cleanup
Back of case showing “raft” before removal and cleanup

 

Cleaned up lower ready for test fit
Cleaned up lower ready for test fit

 

Fits like a glove!
Fits like a glove!

PRINTING THE CASE UPPER

Given the experience I had with printing with the Hatchbox filament, I wanted to see how printing the case upper would be using the M3D filament.   I just chose one of the other M3D filaments to contrast the black lower.  The printer’s program calculated this to be a 14 hr print.  But, the output is looking good for far–no lifting of corners or warping.

Printing the Upper Case Printing The Upper Case

About 12 hours later… DONE!

Print completed for the RasPi case upper
Print completed for the RasPi case upper

 

After removing the raft and cleaning up stray flashing
After removing the raft and cleaning up stray flashing (inside)

 

After removing the raft and cleaning up stray flashing (outside)
After removing the raft and cleaning up stray flashing (outside)

 

Fits great!  Just need to figure out the case screws.
Fits great!  Just need to figure out the case screws.

As mentioned earlier, I wanted to print the case version with the VESA mounting tabs on the back of a monitor.  In this case, they needed to be 75mm spacing.  Aligned nicely!

Final Assembly Final Assembly

This was a fun project.  While not a perfect printing experience, it was good enough for a first major print project.  Lessons learned will be turned back into the printing experience and improved upon on subsequent projects.

After mounting this Raspberry Pi w/case to the back of the monitor, the next mini-project is to get the Raspberry Pi working with the 3D printer.  There appears to be groundwork already done in this area, and I will follow the path already paved.

Wayne / AG1A

NEAR-Fest XIX

NEAR-Fest XIX  – April 29 – 30 will be held at the Deerfield Fairgrounds –  34 Stage Rd, Deerfield NH.  Open: Friday 9:00 AM to Saturday 1:00 PM – the Grand door prizes are drawn at 1:00 PM Saturday.

More info:  near-fest.com (be sure to scroll down).

Lots of buyers and sellers usually attend (depending on weather) plus some commercial vendors.  Sellers are dispersed over a significant portion of the fairground, so be prepared for a little bit of walking –  usually, 2 or 3 trips around the grounds will give some good ideas of what is available.  Most sellers will negotiate – so make an offer, but don’t wait too long – great deals go quickly.

The best part of the event is the people!  You’ll likely run into a few of your radio buddies as you wander the fairgrounds.

How to Build a Ground for your Shack and Feedlines

When I began construction of a dedicated 8-Circle Receive Array antenna system for the low bands (160m – 40m) some time ago (see part one in this series for details), I knew that I’d have to use good Ham Radio grounding practices…

This is an article about Ham Radio grounding that I wrote some time ago when I added a second ground and entry point for my shack for some additional antennas. The ground system used was a simple one that would make a good system for a new HAM’s first station. The copper bracket on the rod can mount the feed line arrestors needed for feed lines before they enter your house. All one needs is the ground rod, the bracket, arrestors for your feed lines and a 12 gauge wire into your shack to ground your radio and you’re ready to get on the air. You can also use the arrester as a place to disconnect your feed line(s) when you’re not using the station to protect your QTH from lightning.

Source: Receive Antenna For The Low Bands Part 2 – Second Shack Entry And Ground Point | Our HAM Station

Fred, AB1OC

Radio Amateurs Developing Skills Worldwide