I have just tried using the flush trim router bit, following my template, trying to cut the exact same shape in 18mm MDF again, but it appears to be struggling/burning.
I have just tested this with 4mm MDF, and it was fine.
Are you cutting everything in one go, that's a bit much for a 1/2" cutter? If so it might be better to do a rough outline cut with the jigsaw first. Draw round your follow jig with a pencil then cut a few mm outside the line
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