measure the thickness of groove to put gasket in and adjust scale to fit I've had two different sizes on my couplers.
Tpu for gasket use whatever settings you want really but sticking to 100% infill will be best bet to keep from falling out while decoupling
use whatever plastic for sleeve pla pro would be best bet ive had decent use of asa 100% the infill. worse case it will be just a one time use piece ( ive only had 1 fail as a one time use but i was being lazy on infill on that one and it was cheap pla.)
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