This is a fix to the plastic base of an inexpensive Staples office chair. I break one of these cheap plastic chair bases every 6 months or so. The replacement part fixes the hole for the caster and reinforces it. Everything fits very snug, no need to glue. I measured everything and created the part in Blender. I printed in PLC at 3.5 layer height with 100% infill to give it strength. I had to use a cooling fan because the part is so small. The first one I did bulged because the layers did not cool/harden fast enough. Import into Blender and customize for your break...