Yeah it did have a single Z axis when my mate got it, it was a top mount setup on a flimsy acrylic plate. He set it up with dual Z steppers mounted on the bottom with brackets from thingiverse printed from PLA but the brackets he printed melted from the heat of the steppers and they were softening up and distorting every time the machine ran. So I ditched the printed brackets and ordered some metal brackets which should arrive in a few days.
It wasn't the load on the motors causing the issue it was the holding current when they weren't moving causing the issues during long prints. Some of the prints he was doing were big flat things where there was almost no Z movement , so the steppers were sitting for ages just holding the load on each layer. For thinner taller prints the motors ran colder than most of the steppers I've got on my printers.
He had two different lead screws in it when he dropped it off and they had a slightly different pitch which caused quite a few headaches until I decided to pull them both out and compare them.
The machine is in pieces right now so I can't really show you any pics. When I get the parts and get it all back together I'll post a few pics.
I'll be glad to see the end of the bloody thing to be honest, if it were mine I would have salvaged what I could off it and built my own RepRap with the parts.
It wasn't the load on the motors causing the issue it was the holding current when they weren't moving causing the issues during long prints. Some of the prints he was doing were big flat things where there was almost no Z movement , so the steppers were sitting for ages just holding the load on each layer. For thinner taller prints the motors ran colder than most of the steppers I've got on my printers.
He had two different lead screws in it when he dropped it off and they had a slightly different pitch which caused quite a few headaches until I decided to pull them both out and compare them.
The machine is in pieces right now so I can't really show you any pics. When I get the parts and get it all back together I'll post a few pics.
I'll be glad to see the end of the bloody thing to be honest, if it were mine I would have salvaged what I could off it and built my own RepRap with the parts.