Taking the inspiration from Jachyms answer I managed to produce the following stamp:
My technique was slightly different, as the geometry of the SVG is pretty complicated and I kept losing track of which faces I wanted to keep (is there a way to mark faces in some way?), but I would not have known how to approach this if it weren't for Jachym.
For those interested, my approach was:
- extrude SVG
- "Fatten" one side to get the taper
- Reduce the number of vertexes on the fattened side, by selecting and merging by distance
- Manually nudge some of the vertices so I have a defined permimter
- Create a circle
- Manually bridge the vertices (I suppose I could have used edge loop, but I kept losing count of the vertices - ADHD fun). Maybe theres an easier way to display selected vertice count?
- Extrude out the handle.
No doubt the geometry is appalling (its evident that there is lots of internal criss-crossing of edges - maybe there is a way to easily clean this up?), but it seems to slice ok for 3d printing, which means its ok for my purposes (pottery stamp), but I appreciate that Jachyms answer is the correct approach for this kind of thing.