I’ve recently started working on a web-based parametric modeler for making 3d-printable panels full of greebles/nurnies using javascript and Three.JS. The general idea is to have a base shape and allow the user to draw rectangular sections that then get filled in with additional details.
Currently, the system supports beveled extrusions and arrays of buttons, but more feature types are on the way. To see it for yourself, head here: http://adrianherbez.net/greebles/03/
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