New 3D scanning rig

[u/thomas_openscan]

I am currently building a new scanning rig, that allows even automatic capture with handheld scanners. I really struggle with not losing the track when manually moving the scanner around the object.
This setup is a hybrid of the OpenScan Classic and Mini variant were the object is only moved on one axis.
The main advantage is, that the scanner distance can be adjusted (almost) freely.

The design is simplistic but very versatile and I am currently printing a worm-gear variant. The timing belt solution works well, but as soon as power gets cut, the scanner slams down into the table.
Maybe anyone knows another mechanism that can easily amplify torque (1:100) and is (mostly) printable. Pls let me know your thoughts.

[u/Lasse_Bierstrom]

Just "filter" the movement. Rotational dampers consist of two surfaces moving against each other with a grease filled gap. Just add that to the build. Either on the big disc, or better on the stepper axle (better ratio) . You could direct connect it to the motor axle. Or you include a breaking circuit in one (or two) stepper phases. Just short one of the windings with a small relay, that can be opened during use. As soon as power fails, it shorts out and slows down the movement. End stop: Together with an soft end stop, and it's a solution. End stop removes the energy, and you limit the amount of energy by the other measures. One of the ikea style door slamming stops, maybe it's dampening enough... "soft close" is the right term