An airsoft suppressor model from FoamPro Armory is available on Printables and attaches to flash hiders of 25 millimeter outer diameter. Variants include a wide front opening and a tighter opening meant for stronger sound reduction, and each carries an orange end piece users can take off.
The makers keep a Printables page for later releases, run an Etsy shop for purchases, and offer an email list that supplies extra exclusive models and modifications.