3D printed WiFi controlled mechanicel bell for christmas
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1975
updated January 30, 2022

Description

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HW needed:

  • screws M3x6
  • screws M3x10
  • 1pc set screw M3x6
  • 1pc screw M3x12
  • 2pcs nut M3
  • 4pcs 608 bearing (8x22x7 mm)
  • bell, diameter max 55 mm, height max 65 mm: Aliexpress 1, Aliexpress 2, ČR
  • N20 mini motor with gearbox, 6V, 200 RMP: Aliexpress
  • 6V DC power source

Optional HW:

  • Remote control over WiFi: Sonoff SV WiFi relay switch low voltage: Aliexpress, ČR
  • For discontinuous ringing: Cycle Digital Time Delay Relay Trigger: Aliexpress, ČR

Before the print:

  • Headstock is made for specific bell. In case you use different bell, some adaptation might be needed.

Print instructions:

  • PLA
  • 0,2mm or 0,3 mm layer height
  • MOTOR_MOUNT, DRIVE_WHEEL, DRIVEN_WHEEL and AXLE with 100% infill
  • Use 3 perimeters for stand and headstock.
  • Motor is little bit on the noise side when under the load, so I recommend to print MOTOR_MOUNT and MOTOR_HOLDER from softer TPU.

Print postprocessing:

  • Remove custom support from STAND_A and DRIVEN_WHEEL.
  • Tolerances are tight, so some sanding might be needed. But with well calibrated printer the assembly should be smooth.
  • Remove bridging in holes in STAND_A and MOTOR_MOUNT.

Assembly:

  • Insert M3 nut into MOTOR_MOUNT, press motor mount onto the motor axle and secure it with M3 set screw.
  • Axle assembly – from left to right DRIVE_WHEEL, bearing, STAND_A, bearing, MOTOR_MOUNT:
  • Secure position of the DRIVEN_WHEEL with superglue.
  • Use M3x12 screw and M3 nut to attach bell to the HEADSTOCK.
  • Use M3x6 screws to assembly the rest of the mechanism:
  • Mount the MOTOR_HOLDER to the STAND_A using M3x10 screws. Pay attention to the orientation, see image above.
  • Optional: use holes in STAND_A together with SPACER to mount Sonoff WiFi relay, use M3x10 screws.
  • Optional: use holes in COVER to mount delay relay trigger, use M3x6 screws.
  • Do the wiring.
  • Put COVER on, use M3x10 screws to secure it to the rest of the assembly.
  • Optional: put some rubber feet at the bottom to prevent item from moving on the table.

Happy ringing!

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