CR-10 V2 Z-Axis Timing Belt Tensioner

When disabling the stepper motors and manually leveling I noticed the X axis rail could come out of level since the Z axis stepper lead screw would turn on one side but not the other. A timing belt may prevent this.

I also believe this may sync the two Z motors "slightly" more than stock possibly providing more even layers.

For the new Z mounting blocks that give room for a pulley I used FattyGuyRiley's design since they don't cost you any Z height: https://www.thingiverse.com/thing:3504265

I could not find a simple belt tensioner that fits FattyGuyRiley's belt height so I sketched this up in Sketchup.

You will need:

• 4 X M3 T-nut which you can find here: https://www.thingiverse.com/thing:3050607

• 4 X M3x8 screws

• 1 X M4X20 (or 30) screw

• 12 X M3 washers (unless you resize the thickness of the tensioner bracket)

• 4 X M3 nuts

• 2 X GT2 Timing Belt Pulley (20T, 8B):
  ( https://www.amazon.com/dp/B077GMKW1C/ref=cm_sw_r_cp_apap_6efY23tVUgKGW )

• 1 X GT2 Toothless Timing Belt Idler:
  ( https://www.amazon.com/dp/B078GPKRP1/ref=cm_sw_r_cp_apap_hVqYfgCPQhXgG )

• 380 Teeth Timing Belt:
  ( https://www.amazon.com/dp/B01AXRB13Y/ref=cm_sw_r_cp_apap_dXpvskr4oNgth )

There is some adjustability of this tensioner if you use this size belt and pullies

When it's all together make sure your Z screws still have some front and back movement in the bearings and nothing it too tight to the point of binding (Very important)

***** WARNING: the loosest "setting" is still tight for some belts. You may want to shorten the reach of the tensioner bracket for your use ********