I printed with PETG 0.2mm layer height. I increased perimeters to 3, solid bottom layers to 6, and infill to 60%, not to increase stability but to add more weight since the knife otherwise feels a bit unnatural and tends to tip over to the blade when putting it down. No support structures are needed. The new version changed the thin spikes design to be more durable. I had concerns with the PETG material and the dishwasher but it turned out that this is not causing any trouble.