1. Got a question or need help troubleshooting? Post to the troubleshooting forum or Search the forums!

Drive Gear flew off and I can't find it... replacement recommendation?

Discussion in 'Troubleshooting' started by Stera8, Dec 24, 2017.

  1. Stera8

    Stera8 Member

    Joined:
    Dec 31, 2016
    Messages:
    32
    Likes Received:
    15
    I heard a bounce like coins fell and I go "eh I'll find it later!"

    I come back into the room to see my Santa ornament and the filament snapped and was printing blanks!

    I noticed the sound of change was not change...but my drive gear.

    I cannot find it.

    Does it matter what type I buy? I saw these on Amazon?

    https://www.amazon.com/Witbot-Stain...-1-spons&keywords=drive+gear+3d+printer&psc=1

    Thank you in advance
     
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    21,544
    Likes Received:
    7,063
    It matters a bit since if the one you buy has a smaller or larger diameter inner hole it will not mate onto the drive shaft (but most NEMA 17 steppers for printers have common shaft sizes).

    It also matters if the gear diameter is different since your steps/mm for the extruder will change. The outer diameter on the one you linked is 12mm and the one on the C2/R2 is closer to 9mm (9.1 is what my micrometer says with a quick check). I do not know how may teeth are on it.
     
  3. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    21,544
    Likes Received:
    7,063
  4. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
    Staff Member

    Joined:
    Feb 18, 2015
    Messages:
    5,865
    Likes Received:
    3,561
    Almost all direct drive extruders like this design use a Reprap style hobbed drive gear. Just a quick summary, they are usually sold by series labeled as MK:

    For a chart, with pictures of the most common types look here: http://reprap.org/wiki/Drive-gear. The links to sellers on the wiki page are old and pricing is better on Amazon (N.A.) and China.

    The one Mark pointed to appears to be an equivalent to the one used on the R2/C2 and as he mentioned most NEMA 17 steppers have a 5 mm drive shaft (with geared steppers being the exception).
     
    mark tomlinson likes this.

Share This Page