RockBros Cargo Rack LED taillight Light Adapter

I purchased a Rockbros cargo rack on amazon (https://www.amazon.com/gp/product/B07219CDH7/ref=ppx_yo_dt_b_asin_title_o01_s01?ie=UTF8&psc=1) and while the rack itself is great it only has a reflector with no option for adding an actual rear light.

I really wanted to add this: https://www.amazon.com/gp/product/B07W5Z4H9C/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 but it is meant to go around the seat post and there is no way to add it to the cargo rack.

I designed this to fix that problem. I made this to be a tight fit that slips in and it is held in place by one screw (Spend the extra $0.50 and get a stainless Steel screw. You only need one and it will save you a lot of rust problems later). I have about 60 miles on mine so far. I would like more testing however after getting hit by a car while riding and the bike flipping about 20 feet into the air and crashing down, the adapter survived while the frame, forks and wheel got bent. The photo of the rear with the LED still attached is from after the accident. You can see it's still firmly in place so I am pretty confident it should hold up to daily use. (Side note the PETG printed chain guard also survived a direct impact with just some scratching. PETG is good stuff.)

Print in PETG. PLA may work but it is very ridged and prone to cracking under shock while PETG has some flex to it and is more suitable for such a part. PLA also has a habit of getting very soft in the summer if it gets to hot.

Print with supports everywhere. I do 10% and they come off easy enough.

I printed this with 8 walls at 40% infill since it is a functional part. I would probably not go lower then 30% but keep the walls at 8. You are going to be drilling into it. This goes for the bottom and top layers as well.

To Install you have to remove the reflector and rivet holding in the reflector so this is a permanent modification. Do so at your own risk.

Once the reflector and rivet are removed use a file and smooth out the inside where the rivet was as you need a clear path to install.

Insert (side with AA up) into the shaft and gently push it into position. You many need a mallet to gently tap it in. I made it a somewhat of a tight fit on purpose.

Once it is seated in the proper position use a drill for a pilot hole through where the rivet was and add a wood screw to secure it in place. And that is it. The back has a round section the same diameter as a standard bike seat post that these things love to clamp around. Add whatever attachments you want. The screw does not have to be long. Really a 1/2 inch is more then enough. It is just there to prevent the mount from sliding.