Sleep Countdown

My son enjoyed counting down the days (we use ‘number of sleeps’ for simplicity) until Christmas using a store-bought countdown shaped like a snowman. So I figured a non-holiday themed one would be nice for other events throughout the year he looks forward to. 

Both wheels have #0-9, allowing a countdown up to 99 days/sleeps. There is a hole on the back for mounting, and the space below ‘until…’ on the front can be used to identify the event (we use a laminated notecard and dry erase markers - or flat 3D prints with some sticky tack or hot glue)

Assembly note: I forgot to take a picture of the inside before I glued the face on, so I attached a screen grab from Fusion 360 and marked it up. The arms on the tensioners are bent inward so they rest against the discs. These hold the discs in place and provide just enough pressure/friction that the discs don't turn on their own without the knobs being handled. Otherwise, the assembly is pretty straightforward. 

1. Discs go on the pins on either side of the base. 
2. Tensioners go on the 2 pairs of pins, bending the arms as described. 
3. Place the face on top with the shafts of the discs through the round holes. **Make sure at this point that you've put the discs on the correct sides (numbers will be upside down if the discs are on the wrong sides). Glue between the rim of the base and ends of the face. 
4. Knobs go onto the exposed shafts from the discs with a little glue. 

Assuming a 0.2mm layer height, color change for the discs will be layer 15 (3.00mm), and the face will be layer 16 (3.2mm). The disc layer change will also change the color of the shaft, but its covered by the knobs when assembled, so it won't be visible. 

For tiny hands, a bit of lubricant on the bottom and sides of the disc doesn't hurt, I used a little bit of dry lock lubricant spray, but most anything will work. 

Whatever your standard printing parameters are should be fine. No supports or brims necessary. 

***Edit - 03.14.23

• Added step file for complete assembly