Tension the Belts

Required Tools:

  • 2.5 mm hex key

Time Required: About 30 minutes.

Difficulty Level: Medium

Maintenance Period: Rarely, when you suspect a belt has been compromised or when prints are looking shifted.

Comments:

Our machines are tuned and calibrated before leaving our workshop, but in case you suspect the belt under the heated bed has been compromised or the prints are starting to look shifted. Belt tensioning is something that you will rarely have to do. The tension can depend on ambient operating temperature or wear.

Steps to increase the X-axis best tension:

  1. Locate the belt tension plug with the brass insert inside the x-axis belt clamp mount. There is a 50 mm screw going through the x-axis belt clamp mount and the belt tension plug as seen in the figure below.
  2. Using a 2.5 mm hex key, slowly turn the screw in a clockwise direction and notice the belt tensioning. You will reach the perfect tension when the belt will vibrate 5-6 times when strung. If you can hear the vibration, the belt is too tight. If you can hold both the top and bottom of the belt together with little pressure, it is too loose.

Steps to increase the Y-axis belt tension:

  1. Turn the printer Off and allow it to cool before continuing.
  2. Manually move the Extruder Assembly to the R/H side.
  3. Place padded material to the right side of the printer.
  4. Rotate the printer on to its right side so that it rests on the padded material.
  5. Slowly pull the Quick-change Build Platform towards the front of the printer.
  6. Look through the access port on the bottom side of the printer to locate the Y-axis belt tension plug.
  7. Using a 2.5 mm hex key, slowly turn the screw in a clockwise direction (to increase tension) and notice the belt tension increase. You will reach the perfect tension when the belt will vibrate 5-6 times when strung. If you can hear the vibration, the belt is too tight. If you can hold both the top and bottom of the belt together with little pressure, it is too loose.
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2 Comments

  • 0
    Avatar
    Drew Rokeby-Thomas

    I found this very helpful, was getting very slightly ovalized prints, belt tightened and it seems to be fixed. One thing you might consider changing is that the hex head screw you tighten is on the other side of the block shown in the image. Great printer, as I get more use out of it I see all the really long term thinking that's gone into it. In this case rather than threads into the printed plastic parts, nice brass inserts. Won't matter for a few years, plastic vs brass insert, but it means this baby should last many more years than one without all the inserts! So glad I went with you rather than one of the big names!

  • 0
    Avatar
    Warren Strome

    The thoughts behind which orientation to use for the tensioning plug had alot to do with "forcing" a technician or user to turn printer on its side to have a good look underneath and check the underside moving parts. Glad to hear you are getting good use of it!

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