This instructable really interested me, Frameless Laser Harp - 4 , but i've never worked with steppers before. the stepper i got has 4 wires, but the stepper in the instructable has 6. on page 2 there is a wiring guide, but that wasn't very helpful to me, i didn't really understand what i'm supposed to do with the wires. This is the stepper i have, https://www.sparkfun.com/products/10551?gclid=Cj0KEQiApruyBRCFqoDu1pbk9rkBEiQAF8EFdVmEBorGt6koPmFkaibEpRmZ94Z6r8BWhmTqAL… . Any ideas?
I am currently putting together a complete tutorial ish video to explain how to convert from the Harp based on unipolar stepper (Not very well driven) to a Bipolar Stepper Driven correctly and massivly simplified code to go with it... standby 
Ah, one thing I forgot to also mention and it may be important. ( I am so used to them being there I completly missed the fact they were not there)
Decoupling capacitors on the supply rails near the chip for both the +5V and the 12V.
I dont see any on your board and there essential for reliable operation
looking at this circuit from TI it clearly shows them, and the value required
