I have made three cheap changes to my belt system.
These changes reduce belt stretch, reduce the need to tighten belts, show me when a belt needs to be tightened and makes tightening much easier.
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Changed to steal core belts for X and Y axis
https://s.click.aliexpress.com/e/m4uJLu6c -
3D printed and installed the KreekLove belt tensioner on my x axis https://www.thingiverse.com/thing:3049613
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Added a spring to the Kreeklove system which ensures the belt remains tight and shows me if it is loose
https://openbuildspartstore.com/timing-belt-tension-torsion-spring/