SBR20 Linear Rail End Stop / Safety Lock

Function If you are building a CNC, camera slider, or robot using SBR20 rails, you need a way to keep the carriage on the track. This printed part acts as a hard stop at the end of the rail.

Design

• Clamp Fit: The C-shape is designed to slip over the 20mm rail.

• Safety Buffer: It provides a physical barrier so that if your motor over-travels or you slide the carriage too far by hand, the ball bearings won't pop out of the block.

Hardware Required

• 1x M3 or M4 Screw & Nut: (Depending on the hole size in your print). You will need a screw to pass through the flanges to tighten the clamp securely onto the rail.

• Note: If the fit is tight enough from the printer, it may work as a friction fit, but using a screw is recommended for safety.

Print Settings

I printed this with normal settings, which are sufficient for a static stop.

• Material: PLA, PETG, or ABS. (PETG is recommended if you expect the block to hit it frequently, as it is less brittle).

• Layer Height: 0.20 mm or 0.28 mm

• Infill: 20% (Grid or Gyroid)

• Walls: 3 walls (To prevent it from cracking when you tighten the screw).

• Supports: No supports required if printed on its flat face.