Circle cutter

[Sara-S]

There are many of these on the market.  I just bought the Truecut360, which is the best I have tried.
https://truecut.graceframe.com/en/product/truecut-360

The reason is that it uses a rotary blade, rather than any type of straight blade.  It doesn't snag the fabric & makes smooth, clean cuts.  Of course it takes some practice to use, but it wasn't that hard to master.
It even works on soft leather. (I haven't yet tried it on thicker or stiffer leather.)
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[Ohsewsimple]

Never knew these sort of things existed!  Bit pricey but if you need one …….

[Bodgeitandscarper]

Available in the UK from youknowwhere - linky

I'd like one, but it's a bit pricey...

[grndkntrl]

There's also the Olfa Circle Rotary cutter, which also uses rotary blades (the readily available 18mm ones) and, if you're price conscious, only costs between about a third to a half that of the Truecut360:

[Sara-S]

It is pricey, but I got an e-mail offering a discount.  That made it worth buying.  The OLFA also uses a rotary blade. I have tried that one, but found it more difficult to use.

[Sara-S]

Here’s an appliqué I made, using it. It’s sewn onto a dress to conceal a hole.

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[KayK]

I have the Olfa one, and it is a tricksy little beast to use!  Once you have got used to it, it's ok.  A lady at a sewing class had one similar to the Grace one, and it was easier to use.  I think she got it from Hobbycraft!

[Sara-S]

At our guild meetings, we always have a Give Away table (for who ever is destashing). So at our last meeting, I gave away the OLFA, since I’m not using it.