TronXY X3 X Axis Belt Tensioner (w/ Adj Z)

This is a remix of rikkie2000's x belt tensioner for the TronXY X3. I made so modifications to allow using some spare tnuts that come with pretty much every kit. I also modified it to allow for mounting my adjustable z bracket to it with some options on mounting positions.

Big thanks to rikkie2000 for creating it first. I just made some changes.

[UPDATE 2017-01-30] Added 'X_Belt_Tensioner--Adj_Z_Bracket.stl' after some feedback from @dapackers . This should be much stronger and lowers