This bracket it to anchor the top of my cats wall mounted bed.  Unfortunately I couldn't get out the screw currently in the bed but I over snugged the screw, pic may show it.  This is the link to the store I ordered my cat wall bed and shelving from https://rshpets.com/en-us .   I highly recommend them!

I am printing these in PCTG with very similar printing settings to PETG.  Recently I've had better luck with PCTG being less hydroscopic and easier to print. I am using Hillman 3 #8 Nylon Drywall Anchors for the wall, overkill I'm sure but.  Also I added a washer to the screw from the wall anchor kit.  I will crosslink the brackets I've modified and am installing under the bed.

https://www.printables.com/model/1054912-shelf-support-bracket-175mm-thicker 

Also note cats will chew on the wood!