It’s about 8 inches in diameter.
I set flat/max depth to 4mm (0.16"), on a hunch.
I considered it, since it is usually a mandatory step to avoid bubbles, but this time I was concerned that while applying the thin layer of clear epoxy for sealing it would fill-up the tiniest/shallowest grooves, and then the black epoxy could not go as deep and it would end up before sanded away. Also, bamboo is not prone to bleeding from my experience. So I didn’t.
I should have grabbed a few pics of that, so this was indeed the part that required a little care. My epoxy pour was about 1.5mm thick initially, I first surfaced 1mm off, and then reran the same surfacing pass but lowering Z zero by 0.1mm each time (a bit tedious, but I wanted to be super cautious, I already did that mistake in the past of shaving off too much in the last pass and losing detail). 0.1mm (0.004") sounds like a very thin layer, but it’s almost too much and I got lucky: my final 0.1mm pass removed all the remaining epoxy while cutting only very slightly into the wood. Next time I do detailed epoxy work like this, I will probably run the last passes using 0.05mm Z increments. V-carve is so incredibly sensitive to Z zero…even with acute vbit like that.
I also learned another lesson: to always, absolutely surface the material before v-carving. Even though I know I should, I have a tendency to be lazy sometimes and skip the surfacing pass when I think the material was “flat enough” or the carving is coarse enough that it will not show. Well if only for the pleasure of seeing that very lass 0.1mm pass shave off the epoxy while not leaving any high spots, I think I will now surface my stock for any vcarving project, it only takes a few extra minutes.
I’m happy I did not have enough black die left, I would otherwise have gone for a very opaque black epoxy, but that was the opportunity to experience that a slightly translucent mix brings up the color (red in this case) in shallow spots, while still looking pitch black in deeper areas.
This made me laugh, as this is exactly what I thought: “well, I’m not going to use that when we have the inlaws for dinner”