Kallax Table to Kallax Cabinet
thingiverse
IKEA doesent sell this anymoore, so i printed it! https://www.amazon.de/LINNMON-Verbindungsst%C3%BCcke-Stahl-verzinkt-St%C3%BCck/dp/B00K8MA6PY its a very tight fit, maybe you have to make it a bit larger to fit!
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