The stock bracket for the SQ-70 protein skimmer (possibly fits sq-50 as well) didnt have a very wide range of adjustment for my sump which had 8 inch walls to had hang off of. To get my skimmer tuned in, i needed the skimmer submerged only 6-ish inches and the stock bracket couldnt accomodate.

This backet lowers the lip that the skimmer can hang off of, and is similar in size to the rest of the stock bracket.

Print in the orientation provided and use supports (excluding the screw holes, support the slide hole).

use an M6 screw to tap the screw hole with threads, that way you can use the stock skimmer's plastic screws.

print in PETG (or other non-water soluble plastic), as PLA is water soluble