Member tool
The tabs that hold the layers apart should be invisible from the front. That is most of the craft.
Nothing is uploaded. It runs in your browser, so your files never leave your machine.
Part of the Maker Toolkit: fourteen tools that share one shop profile and one product list, so what you set up here is already known everywhere else.
Questions
By spacer layers with tabs that sit behind the front frame, so the structure is hidden from the viewing angle. The alternative, gluing blocks between layers by eye, is what makes the depth inconsistent and the shadows uneven.
Deep enough that the shadow reads, shallow enough that the frame does not dominate. Between three and six layers of 3 mm material is a common working range. The generator takes your layer count and thickness and sizes the tabs to match.
Yes for this one. The file tools that get a design onto the machine correctly are free. The generators are part of Maker Growth Hub membership.
Next in the workflow
These are not a list of everything. They are the tools this one hands off to, and they already know what you did here.
Worth reading
The tool does the arithmetic. These cover the decision it is serving.
Members
Ten of the fourteen tools are free and stay free — everything that gets a file onto the machine correctly. The four generators and the planner are what turn a craft into a product line, and they come with the Hub.
Join the Maker Growth Hub