Though 3D printing might lower the entry barrier to procuring a bong (especially if you're under 18 in the USA and can't purchase one), actually having a 3D printer itself is quite a barrier.

Both the STL and STEP files for the mold have been released under the Creative Commons Attribution 4.0 license, meaning anyone with a 3D printer can follow along at home.

HASCO 3D prints injection mold inserts with Stratasys PolyJet technology in a matter of hours and can make design iterations at a fraction of the time and cost of traditional tooling methods.