Making money on Runescape using f2p runecrafting isn’t the easiest thing to be doing in the world, but if you do it right you can both make money and train your skill – or use the skill without leveling it and make even more money!
To start with even if you have a low runecrafting level you can still make gold because you can do what’s called rune running. Rune running is when you go to the various F2P alters (air, earth, fire, water) and trade rune essence in exchange for a large number of runes. Since the price and quantities of the runes you receive vary I can’t give you an exact figure on how much you earn, but you can generally make a around 500-2000gp per trip. So if you’re making 1k gold on average and you do 45 trips in an hour you’re looking at 45k gp pure profit.
If you want to earn money from runecrafting while leveling the skill instead of helping others level the skill then it’s simply a matter of first doing the Rune Mysteries quest. From here you can proceed to either buy or mine rune essence. After this you can make your own runes and sell them yourself!
Since the price of runes changes a lot I’d definitely recommend that you first check the grand exchange for the most valuable rune, but if you can make multiples of runes, such as double air runes then you have to remember to factor this into your maths!