If you're looking for some cheap aluminum corner brackets for 2020 extrusion look no further. My video here covers how to create your own. You can make about 10 of these for $6. These run $14 on Amazon for 4, so you're saving a ton of money by making these yourself.
Making these are pretty simple. We'll run down the steps here. You will need 1/8" by 2.5" rectangle bar aluminum. You can get these at your local big box store.
Trace a corner bracket. If you have one of these aluminum brackets already simply trace that one you have. If not we have a very handy DXF file you can print or laser cut to trace. If you laser cut some hardboard stock this works the best.
Cut out the bracket using a miter saw. You should use a Metal Saw Blade to make sure that you get a clean cut. This blade only runs around $20 and cuts the aluminum on a regular woodworking saw.
Take this to your drill press an use a 5mm bit to drill the holes. Sometimes you can find Metric Bits at a big box store otherwise you can get Metric Bits on Amazon. Any HSS bit will work for this soft aluminum.
Step 4. (Optional)
You can use a buffing wheel to brighten up the corner. While the original ones are anodized some buffing, sanding and polishing will get you a bracket that looks just as nice.
That is it! I hope this was helpful please leave a comment if this was helpful for you in saving money!