This weekend a locking lever of one of my TecWall (Slotwall) hooks broke into pieces. Luckily i had an intact sample to rebuild the part in FreeCad. Printed it today and it worked.
I tested a few printing directions and i would recommend to print it with the center axis oriented horizontally and with supports instead of vertically as this seems to provide more robust parts.
Printed with 100% infill ....