Replacement Seven5 Front With 77mm Thread

This is the second Holy Grail product (yeah yeah, blowing smoke up my own arse) for the 75mm filter system made by a particular British filter maker. This bolts to the front of their 75mm filter holder and allows the use of a 77mm circular threaded filter, a polariser for instance. This product is usable when printed in Black Strong & Flexible however the thread loses detail and the part has far too much flex for general use. I'm in the process of getting this design machined in aluminium in order to evaluate the potential for a larger production run.