CR-10s Pro Z-Sync Timing Belt Tensioner

thingiverse

The following modification may be necessary if your Belt tension is a little loose even after adjusting the top blocks outward as mine was. My design applies equal tension on either side of the belt, making it easier and more accurate to set up than the original mod or some other mods that only apply tension on one side of the belt. Thanks to RickSisco for the original "Simple CR-10S Pro Dual Z Sync Mod." His modification adds two GT2 Pulley's and a 6mm Belt to keep your dual z-axis screws in sync with each other. Print the following: 1 x CR-10s ProBeltIdlerBracket.stl 1 x CR-10s ProBeltIdlerPulleyMountBar.stl Two x CR-10s ProBeltIdlerPulley.stl or two x CR-10s ProBeltIdlerPulleyNoBearing (No Ball Bearing Option) Two x t_nut_new_2.stl Optional: New Covers that were removed with an enlarged opening to fit over the pulley! Two x Z-Axis CoverBigHole.stl BallBearingPulley Dust Covers Two x CR-10s ProBeltIdlerPulleyCap.stl Hardware Required: One x M8-1.25 - 40mm Hex Bolt (Minimum Length) One x M8-1.25 WingNut or HexNut One x M8 Washer Two x M4-.70 - 12mm Screw Two x M4-.70 Hex Nut Twenty BB's 4.5mm or Ball Bearings 4.5mm (Not needed if you print the pulley's with no bearings) Note: When printing the bearings, pause the printer at about 3.5-4mm height to insert ten bearings in the bearing-race, then resume printing. If you want to use pulley's with no bearings, you can optionally print the following: Two x CR-10s ProBeltIdlerPulleyNoBearing.stl Assembly: Using two T-Nuts, two M4 Hex Nuts and two M4x12mm Screws mount the Bracket to the top of the 2020 Railing midway. (You will need to remove two Cap Screws from the top of the printer on one side to be able to slide the T-Nuts into place. Re-install Cap Screws once T-Nuts are in the channel) Install the M8 Hex Bolt from the top until it is seated in the Hex recessed area of the bracket. Install the MountBar (Pins facing upwards) onto the lower part of the M8 bolt. Install the M8 washer and then the M8 wingnut or hexnut to tighten bar up. Install your two pulley's. Adjust the bar to desired tightness of the belt and securely tighten up bar so that it will not move. Enjoy!