I have seen the coffee can forges but wasn't overly impressed by the ones I saw online as they used some weird overly complicated DIY burner. Some didn't have a back on them to pass long pieces through which i thought was cool but the doors they built seemed clumsy.
I chose to use a Paint can but I used the bottom of the can as the front. I then created a plug for the back and attached it to what once was the lid. This lid can be removed to allow pass through.
I used a propane torch I already had on hand for some old plumbing jobs i did around the house.
I purchased the following items on line for $37 including shipping
Satanite Refractory Cement
1" Thick Insulwool, The smallest amount i could get was 2 sq' but I only needed 1 sq'
Empty Paint can from Home Depot for ~$5.00
I had on hand
a few metal bits from some old hanging file folders
A propane torch
Edit: I recently made a portable rocket stove for camping with the remaining insulwool but no Satanite as i thought it would break up and i didn't want the extra weight. The outside of that rocket stove gets WAY hotter than this forge so the Satanite is far more important than I thought it was.
Step 1: Feet
I drilled holes and screwed it to the Paint can.