I squeezed my fingers twice on my Hammer sliding table. The original end cap made out of laser cut sheet metal protrudes some millimeters over the inner edge of the aluminium extrution. In case one has griped this part and hits the inner guiding rail, there is no way to get your fingers out without (in my case significant) injury.

 To avoid this situation from happening again or at least lower the possibility of severe harm, i designed this printed end cap. Fits right (as uploaded) or left (just mirror in the slicer).