Roll bender

A compact, hand roll bender mechanism.


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Attribution and


One of the activities of our team is the teaching and development of experiments for STEM education in Uni for kids . And one such experiment was an experiment visualizing how the hadron collider works and how the solenoid works. So, as a result, we have that:


But for the development of this experiment, we need a roll bender. Unfortunately, there is really hard to find a small one and a cheap one, so after some googling we find this and later this one

And after some designing and development, we develop own version of this tool that is robust and 3d-printable.

Materials and methods


The Model is fully optimized for 3d printing

  • Support/rafts: none (if you are not sure in your printer, you can add touching build plate support)
  • Layer height: 0.2
  • Material: PLA
  • Shell line count: 3 /for rollers 5


  • 4x bolts M8x55mm (for passive rollers and top mount)
  • 2x bolts M8x35mm (for handle)
  • 1x bolt M8x85 (for active roller axis)
  • 1x anchor bolt (for the slider, this bolt must be filed as shown on images and glued in knob and ball inside the slider)
  • 1x bolt M8x100mm with rectangular slot (for lever handle)
  • 4x 608 ball bearings
  • 8x nuts M8
  • one piece 10mmx80mm aluminum tube (for lever handle)
  • a tap for threads
  • mood for needlework



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925c23798940b3a0f3d1ba0867d5281f?default=blank&size=40mividamivida added this to the tools collection ago
41bad9720a1a407a736585c6c41badb1?default=blank&size=40Ladislav Tejml added this to the dΓ­lna collection ago
Eec0125100a93affb85751dab34f0192?default=blank&size=40Hardkill added this to the tools collection ago
C8a2a651fffa4134ed2298c43c71b0be?default=blank&size=40flitplane added this to the Dave's Tools collection ago
D7f94ab90ca6abdf410b8e8af2bb0392?default=blank&size=40tjroberts43 added this to the Modeling tools collection ago
Dcd0100ce8a33399a84cb6c62f70e5c2?default=blank&size=40cucharared added this to the tools collection ago
Mini logo color wbackBrainHUB Lab published this design ago