Even the best 3D printers have tiny gaps for bacteria at least, and can cause tiny cuts at worst.
Print a dildo mould and fill it with latex.
Unless you’re printing tiny dildos to put in a bag so when someone is a jerk you can throw tiny dicks at them and tell them to “go eat a dick”. Then by all means, print tiny dicks.
Wizardstan dropping some knowledge
Guys, guys, chillax. Actually, there’s a way to get those little gaps and edges completly smooth and clean. You can use acetone on the 3D printed objets so the acetone evaporates and slowly melts the plastic in like 25-30 min. Here you have a link to the MythBusters article and video (YES, ADAM SAVAGE AND JAMIE HYNEMAN HAVE A BLOG AND YES, IT’S FREAKING COOL):