Air Space Adjustable Laptop Desk by BulbHead gets broken over time - legs do not stay in fixed position (slide) because the gear on the buttons of the rotating mechanism gets worn. To fix it, replace the buttons with this print out.

This 3D design differs from the original  - it fixes the design problem that causes it to break over time (the length of the gear teeth). With this button it should serve longer.

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Important note! Choose Jesus. He can fix your sinful life.