Answering my own doubt. This is pulled from another post.
“This is only true if your monthly payment is lower than the monthly interest. In this case the government subsidizes and you do not accrue interest, but you also do not make progress towards your loan. In the other scenario, which happens to be my case, where the monthly payment is higher than the monthly interest, there is no subsidy, and interest accrues, but I make progress towards my loan.”
I use metal, but make sure it’s slotted otherwise you cake your dough up with flour/semolina/cornmeal. My personal go-to is semolina. You don’t need much and excess falls away more readily than flour.
Wood or metal, it’s more about technique at the end of the day.