7 Segment Counter, v3.1, Single-Digit

Version 3.0 of the 7-Segment mechanical counter. Improved design. This particular model is a sequential counter (numbers 0 - 9) that receives a linear input to cycle the display. This version was designed and prototyped using the Bambu Lab X1 Carbon.

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See video here: 

New for v3.0: 

• Swapping the springs & drums will change the direction of counting (see details in video).
• Cams A, B, & C now include guide discs to keep seg followers aligned
• Segments & followers are now a single printed part (no glue required!) 
• Shape of D-Cam shafts improved to avoid printer corner bulging 
• Increased depth of numerous components to improve rigidity & surface contact area among interacting parts
• Improved tolerances 
• Replaced push-action rubber band with coil springs
• Lengthened pegs on push-action that engage the spring drums
• Dedicated rubber band for D-segment
• Pegs added to seg-plate to allow for equal distribution of force from rubber band

Quantities of each 3D printed component for a complete assembly: 

(1) - BODY_v3.0

(1) - SEG_PLATE_v3.0

(1) - MID_PLATE_v3.0

(1) - BACK_PLATE_v3.0

(4) - SCREW_v3.0

(2) - SEG A_v3.0

(2) - SEG B_v3.0

(2) - SEG C_v3.0

(1) - SEG D_v3.0

(1) - CAM A1_v3.0

(1) - CAM A2_v3.0

(1) - CAM B1_v3.0

(1) - CAM B2_v3.0

(1) - CAM C1 _v3.0

(1) - CAM C2_v3.0

(1) - CAM D1_v3.0

(1) - CAM D2_v3.0

(1) - TIMING_GEAR_No1_v3.0

(1) - TIMING_GEAR_No2_v3.0

(1) - SPRING_v3.0   - OR -   SPRING_v3.1 (added 5/12/25, stiffer inner spring increases tactility. Add lube between inner spring & mid-plate cogs) 

(1) - SPRING_R_v3.0   - OR -   SPRING_R_v3.1 (added 5/12/25, stiffer inner spring increases tactility. Add lube between inner spring & mid-plate cogs)

(1) - SPRING_DRUM_v3.0

(1) - SPRING_DRUM_R_v3.0

(1) - PUSH_ACTION_v3.1 (Updated 8/3/24, two options: coil springs (recommended) or rubber band)

(1) - PUSH_BUTTON_v3.0

Non-3D Printed Components:

(1) -  Rubber band (recommended 2mm x 60mm) - for D-segment

(1) -  Rubber band (recommended 2mm x 100mm) - for A, B, & C segments

Push-Action Option A: (recommended)
(2) - Coil Springs (4mm x 50 mm)

Push-Action Option B:
(1) - Rubber band (recommended 3mm x 60mm)

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

Alternate Options:

2-digit body:  https://www.printables.com/model/972295-7-segment-2-digit-mechanical-counter-body-version