[3dprintscanner]

Depending on the constraints of your community, it can be quite effective just to go out and talk to people in the physical world and show them / get them to try your service. You can use nearby meetups and similar events that already have your intended audience and a place which they will be happy to give you the time of day. This gives you the benefit of immediate feedback and a local set of users that you've personally met and have built rapport with and will scale just fine to a few hundred users. I've been trying this approach with my London based events sharing community https://onlythebestevents.com and have been pleased with the results so far.