A simple curtain rail stopper for c shaped rails. A M3 screw and nut will fix the stopper to the rail. The nut is press fit into the insert.

Dimensions

Insert

• base: 10.8x10.8mm
• base depth: 4mm
• node hight: 1mm
• nut diameter: 5.5 (flat to flat)
• nut hole depth: 2.5mm

Cover

• base: 10.8x10.8mm
• hight: 4mm

You need

• 1x M3x10 screw
• 1x M3 nut

Notes

My printer isn't very good with small tolerances, so the stopper with the 3d printed thread from HAMMER_T aren't working for me: https://www.thingiverse.com/thing:3296965