The Piranhaclamp was designed by the Kunststoffschmiede https://www.instagram.com/kunststoffschmiede/">Kunststoffschmiede and released as open source under a Creative Commons license. You can find the original CAD files here: https://davehakkens.nl/wp-content/uploads/2018/07/piranhaclamp.zip
This version of the mould has a female threaded M10 sprue, you can use a bolt drilled through the centre fitted to the end of your nozzle, or you can buy a nozzle to fit the Precious Plastic V3 injection moulder here: https://bazar.preciousplastic.com/en/listings/484096-universal-nozzle-for-extrusion-or-injection
This mould has been tested with and works well with polypropylene.
Usually dispatched next day, but may be up to 5 working days.