May 18, 2025
Description
7 segment 3D printed 12-hour clock based on v3.0 mechanical counter. Uses three stepper motors with an Arduino Uno and a DS3231 RTC to maintain and display time. Uses some components from v3.0 while also introducing new parts specific to the clock.
If you found this interesting or useful, please consider supporting my work at: https://buymeacoffee.com/Flower3D.
See Video Tutorial Part 1 Here:
See Video Tutorial Part 2 Here:
This clock is based on the 7 Segment mechanical counter v3.0: https://www.printables.com/model/959686-7-segment-mechanical-counter-version-30-ratchet-fo/
3D printed parts & quantities required for this clock build:
(1) - BODY_MINUTES_v3.2C
(1) - CASE_BACK_MINUTES_v3.2C (updated 5/16/25; previous STL was upside down)
(1) - BODY_12-HOUR_v3.2C
(1) - CASE_BACK_12-HOUR_v3.2C
(3) - MID_PLATE_v3.2C
(2) - BACK_PLATE_SINGLE_v3.2C
(1) - BACK_PLATE_12-HOUR_v3.2C
(1) - SEG_PLATE_HOUR_TENS_v3.2C
(3) - SEG_PLATE_v3.2
(3) - DRIVEN_GEAR_v3.2C
(3) - DRIVE_GEAR_v3.2C
(1) - CAM_HOUR_CARRY_v3.2C
(8) - STAND-OFF_SCREW_v3.2C
(14) - SCREW_v3.0
(2) - COLON_SCREW_v3.2C
(1) - RTC-BRACKET_v3.2C
(3) - HOME_POSITION_SPRING_v3.2C
(3) - TIMING_GEAR_No1_v3.0
(3) - TIMING_GEAR_No2_v3.0
(1) - CAM_A1-6_v3.2C
(1) - CAM_A2-6_v3.2C
(1) - CAM_B1-6_v3.2C
(1) - CAM_B2-6_v3.2C
(1) - CAM_C1-6_v3.2C
(1) - CAM_C2-6_v3.2C
(1) - CAM_D2-6_v3.2C
(2) - CAM_A1_v3.0
(2) - CAM_A2_v3.0
(2) - CAM_B1_v3.0
(2) - CAM_B2_v3.0
(2) - CAM_C1_v3.0
(2) - CAM_C2_v3.0
(3) - CAM_D1_v3.2C
(2) - CAM_D2_v3.2C
(6) - SEG_A_v3.0
(6) - SEG_B_v3.0
(6) - SEG_C_v3.0
(3) - SEG_D_v3.1
(1) - SEG_HOUR_TENS_v3.2C - OR - SEG_HOUR_TENS_v3.2C_withRafts (if needed, helps prevent warping. Rafts will need to be cut off)
Optional 3D printed parts & quantities:
(1) - BODY_MINUTES_v3.2C_TEST-PRINT (reduced-size practice-print to test fitment and tolerance before committing to the full-scale large print)
(1) - BODY_12-HOUR_v3.2C_TEST-PRINT (reduced-size practice-print to test fitment and tolerance before committing to the full-scale large print)
Non-3D printed parts & quantities required for this clock build:
(1) - Arduino UNO
(3) - Stepper Motor, 28BYJ-48, 12VDC
(3) - Stepper Driver, ULN2003
(3) - Limit Switch (10.6mm x 20mm), 16mm Straight Actuator
(1) - Real-Time Clock Module, DS3231
(1) - Barrel Connector M (5.5mm x 2.1mm)
(1) - Barrel Connector F (5.5mm x 2.1mm)
(1) - Power Supply, AC-DC, 9VDC, 2A, (with 5.5mm x 2.1mm barrel conn.)
(X) - Dupont Wires, various lengths & pins (MF, FF, MM, 10cm, 20cm, & 30cm)
(6) - M3 x 6mm (2/ stepper motor)
(6) - M3 x 8mm (2/ stepper driver)
(2) - M3 x 12mm (2/ UNO)
- OR (14) - M3 x 12mm (for all M3 Locations; replaces 3 lines above)
(2) - M2 x 8mm (2/ RTC to bracket)
(4) - M2 x 10mm (2/ limit switch not shared with RTC bracket)
(2) - M2 x 12mm (2/ limit switch shared with RTC bracket)
- OR (8) - M2 x 12mm (for all M2 Locations; replaces 3 lines above)
(14) - M3 Nuts
(8) - M2 Nuts
(4) - Rubber Band, 60mm (D-Segment & Hours Tens Digit)
(3) - Rubber Band, 100mm (A, B, & C Segments)
Printer Settings/Profile:
Bambu Studio Profile:
0.20mm Standard @BBL X1C
General Settings:
Material: PLA
Layer Height: 0.2mm
Infill: 100%
Supports: No
Based on a 0.4mm nozzle
Arduino Files Included:
Library Sources:
License:
Creative Commons — Attribution — Noncommercial — Share Alike
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