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Files.
It's a bit ghett but what you want to do is clamp the wood to something flat that you can stand in front of and then hold it with one hand at each end and run it down the edge like a plane.
If you make sure you keep the angle and go the whole length you should be able to do a bit at a time and get them matching. I put a.... double bull nose(?) on some retro fitted mdf shelves this way to match the one existing shelf.
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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.
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hugo7
Bobbo
@M4xime
Is there a cheap tool/technique that will allow me to a shape a bullnose shape into MDF that doesn't involve buying a whole router? Trying to shape the size of two window sills I'm going to install