Thingiverse
Spring-loaded track tensioner
by Thingiverse
Last crawled date: 5 years, 3 months ago
Spring used are RC4WD 100mm internal springs. Use what works for you.
The promod_rear_sprocket_bearing_v2.stl file is optional but recommended, as the added tension will chew through the plastic in no time. Bearings are flanged 3x10x4.
Make sure you file/sand the pushrod part so it can slide freely in the rail's channels.
Don't overtighten the sprocket screws as it will lock up the tensioner. I used 1 small washer on each side between the rails and sprockets for added slippyness.
The promod_rear_sprocket_bearing_v2.stl file is optional but recommended, as the added tension will chew through the plastic in no time. Bearings are flanged 3x10x4.
Make sure you file/sand the pushrod part so it can slide freely in the rail's channels.
Don't overtighten the sprocket screws as it will lock up the tensioner. I used 1 small washer on each side between the rails and sprockets for added slippyness.