Optical chopper wheel with web

This is a remix of https://www.thingiverse.com/thing:28121

It is modified to add a web along the inner diameter of the slots and add a variable for the slot length. I wanted more slots, but didn't need the weakness at the hub.

See https://www.thingiverse.com/thing:446143 instead, for beveled/knife edge slots and a web.

See also https://www.thingiverse.com/thing:1957311 for a graycode absolute wheel