Great YouTube Channel also- definitely sub worthy!
My Go-To for existing models- I require that students modify designs they find here if they are to print. Great source for inspiration for design solutions!
Great source for filament- I subscribe to their mailing list for deals and flash sales.
An excellent vendor for 3d printing supplies. Sub-worthy.
Digital Magazine dedicated to digital making!
An amazing Tinkercad Designer with amazing ideas and tutorials!