please see my remix of a X axis belt tensioner re designed from the tevo tarantula to fit the A2
2x m5 bolts to replace the ones in the wheels. These need to be about 5mm longer,
1 x m5 plain nut,
You can use one of the old bolts from the wheels as the tensioner.
The belt holder was printed at 100% infill and the other two parts at 60%
100% infill on belt holder
% on remaining parts