Well it's a bit clickbait title I know, but it is made out of single tube that I bought for 170 rubles which is less then $3 for current exchange rate.

I should say that I was inspired by this project https://www.instructables.com/Weldless-Front-Bike-Rack/

I've never done welding so I decided to improvise.

Supplies

Aluminum tube Ø10mm length 2 meters

40mm bolt and nut

PVC tube leftover 15-20mm

2 plastic ties(optional)

Step 1: Prepare, Measure and Bend Tube

I've done tube bending for fist time without special tool. And I recommend to use it if you have access to it.

I've filled it with sand in local playground sandbox where my son was playing :) It is needed for saving tube form while bending

Then I've marked half of it and bended around 100mm plastic tube

Step 2: Measure Again, Bend and Cut

This step is important, you need to figure out how your rack will look like after bending. I recommend to use rope it order to prototype shape of future rack.

My bike wheel is 28" and I've decided that I want to have rack about 40 cm length... now I would use 35cm length of rack.

I would suggest bend slowly always checking with your bike. Rack should mount a bit like a spring

After bending most likely you'll need to cute a bit of tube like I did. I've cut 12 cm from each side.

Step 3: Fatten Ends and Make Mounting Holes

In order to mount it to axe, I've flatten end in vise and made holes.

Round file might be useful

Step 4: Mount Holder to the Fork

For fork holder I've used leftover of PVC pipe (13 mm internal diameter) and 2 plastic tides. You might find better solution, just use whatever you have.