Precision Belt Tension Indicator

I didn't have luck getting belt tension set consistently with other methods or belt tension designs.  I designed  this model using a cheap test indicator to measure the flex on the belt.

The contact points are glued in place to make it easier to print.  The two bases are pinned using a nail.  A Ø10mm x 18mm spring from an assortment was used for clamping force.  M3 screw used to secure the test indicator in the dovetail groove.

The grooved contact points fit a 6mm wide belt nicely.  The smooth contacts are easier to get onto the belt but let the tool slide around too much.