Note:

+ Designed in Fusion360. + Project file attached.

!!! You can find the new version here !!!

https://www.thingiverse.com/thing:4301158

Firmware:

https://github.com/arendst/Tasmota/discussions/11731

If you have questions about how Tasmota software works, visit the Tasmota Discord chat room for a discussion: https://discordapp.com/invite/Ks2Kzd4

BOM:

NEMA-17: https://aliexpress.ru/item/32604882068.html NEMA-17 (5:1): https://aliexpress.ru/item/32586860419.html NEMA-17 (27:1): https://ru.aliexpress.com/item/32586836815.html Driver A4988: https://ru.aliexpress.com/item/1609523735.html Driver A4988 board: https://ru.aliexpress.com/item/32908836265.html 28BYJ-48 + ULN200: https://ru.aliexpress.com/item/32839767528.html DC-DC Step Down Power Supply Module, max=24V (MP1584): https://aliexpress.ru/item/32742116421.html Aluminum Capacitor (100mF, 35V): https://aliexpress.ru/item/32814611460.html

Important information:

1. Modifying a 28BYJ-48 (12V or 5V) stepper motor from unipolar to bipolar tutorial: https://coeleveld.com/wp-content/uploads/2016/10/Modifying-a-28BYJ-48-step-motor-from-unipolar-to-bipolar.pdf
2. The diagrams show the supply voltage of the NEMA-17 stepper motor 12 volts (this is the minimum voltage). The recommended voltage is 24 ... 35 volts (respectively, the capacitor should be 35 ... 50 volts). More information about the effect of voltage on stepper motor operation can be found in the tutorial: (see 5. POWER SUPPLY): http://stepcontrol.com/pdf/step101.pdf

• for 28BYJ-48 (5v) recommended voltage is 12v (only if modifying to bipolar).
• for 28BYJ-48 (12v) recommended voltage is 24v (only if modifying to bipolar).

3. Stepper drivers configuration tutorials: A4988 - https://lastminuteengineers.com/a4988-stepper-motor-driver-arduino-tutorial/ DRV8825 - https://lastminuteengineers.com/drv8825-stepper-motor-driver-arduino-tutorial/ TMC2208 - https://wiki.fysetc.com/TMC2208/