I’ve been using my Xiegu XPA125b amplifier with my Hermes Lite 2 SDR transceiver for some time now and have found it to be a great performer. The only issue I have with the amplifier is that it is passively cooled with the operating temperature often reaching in excess of 50 degrees Celsius. There is an air vent on the right-hand side of the amplifier case and then a very small vent on the rear where the end of the PA heatsink is however, air flow is really poor and so the heatsink can get saturated with heat very easily.
Having recently purchased a Bambu Lab A1 Combo 3D printer I’d already decided I was going to have a go at designing and making a fan assisted cooling system for the Xiegu amplifier.
Having no experience and very little knowledge of 3D printing I dived in head first and hit the vertical learning curve head on. In a fairly short period of time I had put together a design that would work.
Designing the Xiegu XPA125b cooling system using TinkerCAD.
After 11 design versions and 3 x 3D prints I had a solution that fitted perfectly every time. Getting the 12v fans from Amazon was fairly cheap and I soon had the amp cooler working with a temperature reduction of 20-25 degrees Celsius during long waffle overs on the 80/60m bands. The amp now runs nice and cool with great airflow through the heatsink.
Next I wanted to add a Hermes Lite 2 cradle to the cooler solution so that two devices are neatly stacked together. Like the cooler design, I already had ideas in my head and just needed to get them down in the CAD package.
After some tinkering and 3 test prints I had a solution designed that not only created a cradle for the Hermes Lite 2 but, also a top shelf for my Daiwa CN901HP to sit on.
This brought the whole HF transceiver setup together nicely with all the components now being held in place securely.
Xiegu XPA125b Cooler with Hermes Lite 2 cradle – front viewXiegu XPA125b Cooler with Hermes Lite 2 cradle – side view
The 3 fans on the side of the amp are silent which is great, there is a little noise from the air flowing through the case and out the vent at the back of the unit however, it’s barely noticeable. Keeping the case pressurized with cool air and forcing the heat out the rear vent has made a massive difference to the overall temperature of the amp even during long hours on air.
This has been a fun project and a great introduction to 3D printing, I’ve got so many more 3D print ideas now, I think I’ll be spending a lot of time in TinkerCAD.
I’ve just printed and put together a cooler and HL2 cradle for Steve, M0XVT and will be making them to order soon so, if you have a Xiegu XPA125b and want it to run a lot cooler then keep an eye on my website for details of how to buy one.
For some time I’ve been considering purchasing a 3D printer so that I can create parts for my HAM Radio projects. The issue has always been, what printer to buy?
Having searched online, watched many YouTube videos and endless reading I ended up even more confused and no closer to making a decision. In the end I decided to step away from the idea for a while and see where things went.
Some time much later I ventured back to the subject and discovered the Bambu Lab 3D printer range. These were getting rave reviews and were positioned as being ideal for the total 3D printing beginner.
Once again I read as much as I could about the Bambu Lab printers, watched endless videos and searched online for supplies, spare parts etc to ensure they were readily available.
Eventually I had all the boxes ticked.
Relatively easy to use software
MacOS/Linux supported
Can print using the filament types I need for my projects
Good size print plate
iPhone App
Wireless connectivity
Built in camera for time-lapse videos
Multi-colour filament delivery system
Sensibly priced filament
Readily available replacement parts
Active Eco System and community
Looking at all the current 3D printers available in the Bambu Lab range I decided to purchase the A1 Combo model. This has a 256 x 256mm build plate, 4 filament feed print head and the filament Automatic Management System (AMS) that makes multi-colour printing a breeze.
With the decision made all I had to do was find a supplier. Strangely enough buying direct from Bambu Lab gave the best price and with the £10 voucher and 28% off of filament bought at the same time as the printer it was a no brainer.
£528 later I had 10 rolls of filament and an A1 Combo 3D printer winging it’s way to me.
Bambu Lab A1 Combo 3D Printer
2 days later our local DPD delivery driver arrived with 2 large boxes and a comment about how heavy one of the boxes was.
Upon opening the printer box I found it was extremely well packed. The printer comes in a partially assembled form and requires some assembly by the end user. All the parts are really well labelled right down to each packet of screws being labelled with their exact use. All the tools needed to assemble the printer are included as is the easy to follow manual.
Bambu Lab screw packages labelled for each partBambu Lab screw set for the AMS Stand
Another thing I really liked about Bambu Lab is that they supply you with screws for things that aren’t in the box, like the scraper screws shown above. At first I thought this was a bit weird but, in reality this makes complete sense as printing your own tool set is a great introduction to making your first prints.
Next I attacked the heavy box, this contained the 10 reels of filament I’d purchased at the same time. I’d ordered a good assortment of colours that would keep everyone in the family happy.
Installing the BambuStudio software on my MacBook Pro was a breeze. Using the account I setup at purchase time I was soon hooked into the Bambu Lab Makerworld community.
I immediately found the tools I needed to print and set about making my first 3D prints. The software has a lot of functionality, especially when it comes to the designing of your own objects. It’s fair to say the initial learning curve is vertical however, there are some great videos on YouTube on printing downloaded objects using the BambuStudio software.
ambuLab Scraper and Stand 3D PrintBambuLab Scraper and Stand 3D Print
Whilst searching for 3D Print tools on the MakerWorld I stumbled across this really neat filament waste collector that fits nicely onto the X axis support. During the print there is a small amount of waste filament, especially if you are printing a multi-colour object as the print head has to be purged each time a new colour is required. Out the box there is nothing to catch the waste filament and so, it ends up on the floor. Fortunately the MakerWorld community resolved this issue with a multitude of options for collecting and storing the waste, all of which you can print yourself.
3D printed waste filament collection bin3D printed waste filament collection bin
The print speed is incredibly quick, much quicker than I ever imagined and it’s addictive to stand and watch the print take form right in front of your eyes.
Printing an iPhone Stand for my sister-in-law
Once I’d printed the necessary tools and a few downloaded iPhone stands for the family I set about looking at designing my own objects.
The Bambu Studio software does have the capability to design objects built in but, the learning curve is vertical and there are very few videos on YouTube showing how to use the object creation section of the software. This lead me to look for an alternative 3D CAD package that had tutorials on how to create 3D print objects. After a little searching online i found that Tinkercad has a great range of tutorials online to get people started with designing their own 3D print objects.
In no time at all I had an account created on the tinkercad site and was going through the online tutorials to learn how to use all the functionality offered in the free tier.
TinkerCAD – Designing a cooling fan mount
The online tutorials are very good and move along at a good pace with interactive examples that show you how things work. Once I’d completed the tutorials I dived straight into designing some objects of my own.
I’ve still got a lot to learn about 3D printing but, I have to say that TinkerCAD really does simplify the whole design process. Once my object designs were complete, all I had to do was export them in .stl format and then import the STL file into Bambu Studio and send it to the printer.
So far my prints have come out great and I’ve been really impressed with the quality of the finished articles.
I’ve now started on my list of HAM Radio 3D print projects and will document my progress over the next few weeks and months as I progress.
More soon …
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