Add nuts to your shapeOko table in order to allow you to easily block items. Then use this clamp (http://www.thingiverse.com/thing:414437). This will also avoid your table to deform as it's also a foot ;-) I put a 5 pieces version, if you use the "Ditto Printing", this will really speed-up the production process...Drill your table with 5.5. I've updated mine according original location every 7.5cm. 5 Rows x 6 Columns Put a nut inside and screw it under your table.