Hi Patrik, thank you for the feedback. I'd like to give the full picture for other readers.
You contacted us on 10 Oct and I replied the same day. The things you described, free camera control in line-drawing mode, smoother curves and cleaner hidden lines, were feature requests rather than faults in how the app was built to work. I took them on anyway. They shipped in v3.5.1 within a day, and v3.5.2 refines them further. I also wrote to you several times asking for your file and a clear description of what you wanted, so I could get it right.
VAT: 3DPlotter is sold internationally, and VAT depends on the buyer's country, so it is calculated at checkout. The total including VAT is shown before you confirm payment.
Refunds: the terms (section 6) state that sales are final for instantly delivered digital products, and this is accepted at checkout.
The conversation became heated on your side, and I'd rather move past that. I'm a solo developer, and if you try v3.5.2 and something still isn't right, write to hello@3dplotter.xyz and I'll look at it personally. I'd also be glad if you updated your review to reflect the current version.
Rose, 3DPlotter.xyz