Lack Leg Joiner
thingiverse
Here are four 4mm thick square tubes with a 4mm lip in the middle, perfect for stacking Ikea lack tables by joining the legs. Simply print these out and place one table on top of an upside-down table - it's that simple. I've designed two versions to suit your needs: the lack_leg_joiner_short is a quicker, shorter option, but not quite as secure; each end measures 26mm. For a more rigid joint, try the lack_leg_joiner_tall, which boasts 52mm on each end.
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