Yes, free. No catch. The browser tool is free forever. The shape library is free to browse + free to upload to. The future hardware kit will be paid (someone has to pay for the steppers and the aluminium), but the software stays free even if you build the machine yourself from scratch.
If you want to support the project anyway — there's a <a href="https://cncfoam.com/collaborate.php">support page</a>, but mostly we'd rather you just share the URL with one other maker.
If you want to support the project anyway — there's a <a href="https://cncfoam.com/collaborate.php">support page</a>, but mostly we'd rather you just share the URL with one other maker.