Hunter 19 (Pre Europa) Mast Step / Tabernacle blank for Investment casting

Mould blank for lost PLA investment casting for the mast step / tabernacle of my Hunter 19 (Pre Europa) sailboat.

Print a slice of the top part at 100% to test fit.

Print at 103% to allow for aluminium shrinkage.
 

Supports and brim on the top part - none on the bottom part.

This model has no draft.