Moulding planes are considerably cheaper than routers (unless you have a moulding plane collecting habit which some do) and are traditionally what an apprentice would be using all day to make mouldings for their master.
Vintagetoolshop is a decent place to buy them.
Also can be done with a block plane and sanding paper.
Edit. They can be tricky to hone.
On the subject of vintage planes:
Is there a specific technique to getting the blade to stay put (and true) in one of these?
I've got one we used to use as a doorstop pre-kids and I sharpened up the blade the other day. It worked really well... for 2mins.
I don't have a link, I'm afraid, but I have watched a bunch of youtube videos on this - particularly the ones where they do competitive planing
@hugo7 started
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Moulding planes are considerably cheaper than routers (unless you have a moulding plane collecting habit which some do) and are traditionally what an apprentice would be using all day to make mouldings for their master.
Vintagetoolshop is a decent place to buy them.
Also can be done with a block plane and sanding paper.
Edit. They can be tricky to hone.