This is a Gridfinity compatible holder for a chemical washbottle. Its Gridfinity size is full height by 2x2. Original Gridfinity design by Zack Freedman (video describing the Gridfinity system linked earlier).
Printed this one with 4 perimeters and 10% infill, worked out fine and came out very sturdy. Print settings don't matter a whole lot though.
The author marked this model as their own original creation.