Printed 1 in PLA and another in PETG both have held up for 2 months now and have had some knocks and no sign of stress cracks and is stable when a Stanley is full and cats knock it

3 Walls

30%+ Infill

.16-.24 Layer line work fine

Need supports

takes around 5-6 Hours to print

Internal length to slide on sofa arm is 86mm and the cup holder is 88mm 

Will need something like nail glue or super glue both have been tested and work fine