The Contraption - 3D Files Available for the Preview Version
The Contraption is a 3D printed case for creating a handheld HF radio out of a QRP radio + battery + antenna. It is ridiculous, but fun.
With the Contraption, you can turn your QMX or QCX-mini (and someday CFT1) into a handheld portable HF 20m radio. For morse code, you can use a magnetic key mounted to either side or plug an N6ARA TinyPaddle into the bottom. Soon, we will also release a magnetic mount on the side for a tripod mount phone holder.
The files are available now (of this early version) for anyone who wants to try it on their own 3D printer. We will continue to provide the files for free for those who wish to print their own, and we will soon be selling it as a kit with the 3D printed parts and hardware so that you don't have to source your own. Regardless, you will need to supply your own QRP radio, battery, antenna, morse code key, and cables.
Don't have a Just OK Mini antenna yet? go grab one as kit! You'll need one with The Contraption.
Youtube preview video
Disclaimer: Please enjoy this project at your own risk. Mike broke his favorite paddle already. Due to the nature of it, it is possible if not even likely that you drop something and break it. Also, as always use caution when playing radio outside – don't walk in front of cars 🚙 or into trees🌲 when pedestrian mobile, always be cautious of power lines, etc.
Free files for 3D printing
Below are the .stl files to use for 3D printing. Please note that we aren't able to provide 3D printing help. While we do a TON of 3D printing, we aren't experts and only have experience with our printer. We do hope that if you don't mind potentially wasting the filament, that you will print them and give it a try!
License: Free to print & remix, but noncommercial: 📘 CC BY-NC-SA
Here is an image showing the orientation we printed ours in. We printed on standard mode with 3 wall thickness and auto supports turned on. The filament is bamboo brand PETG - HF.
Other things you will need
- QMX or QCX-mini (version for the CFT1 coming soon)
- USB PD battery
- Just OK Mini: ridiculously small 20m portable antenna
- Morse code key with magnetic base or Ara's N6ARA tiny paddle
- 2x of 2.5" x 1.42" x 0.07" steel plate
- 1/4"-20 Heat Set Threaded Insert for the top antenna mount
- tripod thread adapter to attach the top to the antenna
- short 6" BNC cable to connect to the antenna to the radio
- short right angle audio cable to connect the key to the radio (if using magnetic one on the side)
Looking for the magnet mount for your phone that goes on the side?
We don't have that available just yet, but stay tuned!
If you want more info, here is another video: