How to make an elbow?

Machine Shop
2

Would square steel tube work?

If round, soft copper tubing, there are plumbing bending kits available with a steel spring which wraps and supports the copper tubing, then slips off once the bend is complete. Here’s a $12 version from WalMart:

https://www.walmart.com/ip/Tube-Bending-Spring-Set-4-pack-1-4-in-3-8-in-1-2-in-and-5-8-in/164278751?wmlspartner=wlpa&selectedSellerId=0&adid=22222222227000000000&wl0=&wl1=g&wl2=c&wl3=42423897272&wl4=pla-51320962143&wl5=9026792&wl6=&wl7=&wl8=&wl9=pla&wl10=8175035&wl11=online&wl12=164278751&veh=sem&gclid=CjwKCAjw5vz2BRAtEiwAbcVILynG9RY6VTsz77JyA2xWg_33ktIQ6P0B_RbEOZmsb60_F_76moBwyxoCPvgQAvD_BwE

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