+-----------------------------------------------------------------------------------------------------------------------------------------------+
|Amount |Part                            |Link                                                                                          |Price  |
|-------|--------------------------------|----------------------------------------------------------------------------------------------|-------|
|1      |1N5817 Diode                    |ttps://www.amazon.com/dp/B0C1V6Y8ND?ref=ppx_yo2ov_dt_b_fed_asin_title                         |$0.05  |
|-------|--------------------------------|----------------------------------------------------------------------------------------------|-------|
|1      |Pi Pico 1                       |ttps://www.amazon.com/dp/B0BDLHMQ9C?ref=ppx_yo2ov_dt_b_fed_asin_title                         |$6     |
|-------|--------------------------------|----------------------------------------------------------------------------------------------|-------|
|1      |DC-DC Converter                 |https://www.amazon.com/dp/B0CPFDBJ6G?ref=ppx_yo2ov_dt_b_fed_asin_title                        |$0.70  |
|-------|--------------------------------|----------------------------------------------------------------------------------------------|-------|
|1      |USB C Trigger Module            |https://www.amazon.com/dp/B08LDJBN8P?ref=ppx_yo2ov_dt_b_fed_asin_title                        |$6     |
|-------|--------------------------------|----------------------------------------------------------------------------------------------|-------|
|1      |OLED SSD1306                    |https://www.amazon.com/dp/B09C5K91H7?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1                   |$3     |
|-------|--------------------------------|----------------------------------------------------------------------------------------------|-------|
|1      |Copper Clad Board (100mm x 70mm)|https://www.amazon.com/dp/B01MCVLDDZ?ref=ppx_yo2ov_dt_b_fed_asin_title                        |$0.70  |
|-------|--------------------------------|----------------------------------------------------------------------------------------------|-------|
|6      |6x6x5 Push Buton Switches       |https://www.amazon.com/dp/B01CGMP9GY?ref=ppx_yo2ov_dt_b_fed_asin_title                        |$0.30  |
|-------|--------------------------------|----------------------------------------------------------------------------------------------|-------|
|1      |Needle Slide Switch 90 Degree   |https://www.aliexpress.us/item/2255800495180601.html                                          |$0.16  |
|-------|--------------------------------|----------------------------------------------------------------------------------------------|-------|
|1      |A4988 Stepper Motor Driver      |https://www.amazon.com/CenryKay-Stepstick-Stepper-Aluminum-Printer/dp/B0CJY2S46V/ref=sr_1_3_pp|$1.60  |
|-------|--------------------------------|----------------------------------------------------------------------------------------------|-------|
|1      |Case                            |                                                                                              |$1.49  |
+-----------------------------------------------------------------------------------------------------------------------------------------------+
Total: $20

Future iterations
Add seven segment display 0.12 a piece or $0.36 per board vs $3 for oled
https://www.aliexpress.us/item/3256807345368877.html
Cheaper USB C trigger board $1.45 vs $6
https://www.aliexpress.us/item/3256806810933610.html
Use the atmega328P instead of pi pico $2.29 vs $6
https://www.aliexpress.us/item/2251832715531796.html

New total should be:
$9.10

https://lakefox.net/archive/wolles-elektronikkiste.de/en/using-the-atmega328p-standalone

Will need 16mhz crystal ~$.10
And some caps