Mixing Durable and Standard resin - Anyone tried?

[fantasy2]

Wasn’t that a Black + Tough mix? 33% tough and 66% black?

This one:

A bit of resin alchemy

I’m making an object that snaps together (it’s classified, so I can’t post the pics unfortunately), and has very tight tolerences (it’s got to create an airtight seal with a gasket squished by the pressure of the snap-fit), and has to be easy to take apart and put together repeatedly. A tall order for printed materials. I’ve been hacking around, trying to get parts that are both very accurate, and also able to handle repeated snapping-unsnapping without fracturing. Clear by far produces the mos…