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  1. #1
    Engineer-in-Training
    Join Date
    Aug 2020
    Location
    United Kingdom
    Posts
    249
    Hi we have been making functional parts by FDM for nearly a year for our prototypes and pre-production runs.

    In practice using nylon and ABS we have been able to print internal threads down to M3 but it has taken some experimenting with hole expansion in the slicer just sometimes we have to clear the thread form out with a tap.

    We have printed female BSP(like NPT)1/8" threads and hydraulic tested them to 10 Bar in Nylon6 LW with no problems once we had adjusted hole expansion correctly.

    Some times when overhangs cause difficulties we make the item in 2 parts out of ABS and solvent weld them together.

    The great advantage of making small parts bf FDM is the cost of each part is low

  2. #2
    Student
    Join Date
    Jan 2021
    Location
    Southern Maryland
    Posts
    16
    Quote Originally Posted by Gambo View Post
    Hi we have been making functional parts by FDM for nearly a year for our prototypes and pre-production runs.

    In practice using nylon and ABS we have been able to print internal threads down to M3 but it has taken some experimenting with hole expansion in the slicer just sometimes we have to clear the thread form out with a tap.

    We have printed female BSP(like NPT)1/8" threads and hydraulic tested them to 10 Bar in Nylon6 LW with no problems once we had adjusted hole expansion correctly.

    Some times when overhangs cause difficulties we make the item in 2 parts out of ABS and solvent weld them together.

    The great advantage of making small parts bf FDM is the cost of each part is low
    I appreciate your feedback Gambo! That's great to hear about the threading for as small as M3 screws. If you don't mind me asking, what was your resolution to nail down the proper inner diameter for your screws? That's great that the parts have withstood 10 Bar for testing, after printing. What printer do you use (or use the most) for your prototyping?

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