Sharon
I am warning you - its not as simple as it sounds - 10 min a print is gonna be 6 people or less are gonna get a print. That might be discouraging to a majority of people.
If it takes all of them only 10 minutes to do all of the following . . .
First get a login to tinkercad - on a local shared slow network
Then learn tinkercad - step by step show them the combine tools the measurement controls the alignment tools . . etc.
Then learn how to download the file
Then learn how to slice the download put the creation on a flash drive.
Then get you the gcode in working order on a sd card set up correctly for the printer in the time available . . .
I am sure you feel the attendees are intelligent but your gonna have to write all this out and they need to have a handout possibly ahead of time that lists all this out. . . So they have a tinkercad login and know what to expect of the tool chain involved.
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I am not trying to be difficult I am being practical
I have lived through this Same scenario - Many times - I have been asked over and over to do this sort of thing for little shows over and over.
Its disappointing to me and to the people involved when it doesn't work out awesome.
You want to and you need to show that it can be awesome and demoing to a crowd is easy. Give them a good taste the first time and offer to set up a more focused one in the future.
Guiding and training a crowd in a short period of time to do what you have spent a months / years struggling and learning will just diminish your talent and value.
You want to set yourself up to be effective - that means you need to know your limits.
You want to show that 3d printing is an effective tool. This tool takes time to be effective.
Show that you have mastered it without making unattainable claims that about 60 people are gonna get something out of a single printer in a little over an hour.
Show them that a home printer puts out great prints when you nurture it.
Then show off the Shapeways site showing cost of a printer at home and compare it to just getting a single print made on shapeways.
Be a shining light to 3d printing and demonstrate attainable possibilities in front of them.
All this is just like putting a few thoughts on a power point slide at a time - Help people focus on the thoughts you want to get across.
Instead of a crammed tight power point slide with a chapter of text on a single slide that overwhelms and confuses people and turns them off.
If you find enough people to provide Printers so its effective for all of them in an hour. Wow - then that means you would likely need to have about 12 working printers (2 per table) and a person helping run each printer.
12 people helping the crowd by slicing files and feeding filament and warming up the beds pealing off prints - fielding questions and all that. Make that the goal of the next show you do with them. Use this show to validate another more involved hands on show in the future.
As Far as the maker-space I am only engaged at Hammerspace. I teach every two weeks.
The Lawrence maker-space community is difficult to nurture - under funded. . . I don't have the funding or availability it has required in the past nor the time that I tried to provide in the past. Many of the people involved when I was there have since found simpler paths to effectiveness.
Tim