At least some of those aren't junk steppers and Ebay isn't always junk.
The first set are Minebea steppers, and are actually quite good (it was a joint venture with Panasonic up until last year). However, those are short bodies with dampers, the dampeners are awesome for noise, but the short body means you only get 46 or 49oz. in of torque. Which is PLENTY for a printer such as a Rostock or Mini Kossel. I ran those motors on my 1000mm tall Griffin for a short time and a long time on my mini, so yes, they can handle it. I can't say about the second set of steppers, I have no knowledge of them. However, the price difference really isn't as big of a deal as it was even a year ago and for about $15 more, you can get brand new Kysans from Tridprinting and other places. These are new, and 76oz.in. of torque.
Regardless, I would HIGHLY encourage you to get a good, high torque motor for you extruder. In fact, I would even recommend you step up to a geared stepper motor and matching extruder. Something like the Mini Kossel extruder or Griffin Extruder will work with those. The Griffin extruder will work with both motor types. The alternative is to use a geared extruder. I always recommend gear reduction on nozzles .4mm and smaller.
For your power supply, in theory a 20 amp *should* work, however the Chinese use a form of new math that doesn't conform to reality*. So if you want a power supply like that for a heated bed, get a 30 amp. *Always assume it puts out about 75% of what they rate it at and you still want some to spare.
The Buda head works fine.
If you take the time and follow directions on how to assemble it, it can do some good prints. If there is a problem though, they can be a bear to work on. It's overly complex, can become hard to disassemble... There are simpler ways to do things.
Belts vs spectra... BELTS.
Belts, you can get a smaller pulley, and you get a known number to use for calibration.
Spectra is trickier than people think, this is because you have to be able to spool as much filament as your printer is tall. Because of this, Spectra will give you larger diameter pulleys, which means less fine detail, and a harder time calibrating, since you need an exact pulley diameter to calibrate steps per mm. Your printer size means you would need Cerberus size pulleys for your Rostock, not Mini Kossel pulleys if you want Spectra. It's also much harder to install.
The first set are Minebea steppers, and are actually quite good (it was a joint venture with Panasonic up until last year). However, those are short bodies with dampers, the dampeners are awesome for noise, but the short body means you only get 46 or 49oz. in of torque. Which is PLENTY for a printer such as a Rostock or Mini Kossel. I ran those motors on my 1000mm tall Griffin for a short time and a long time on my mini, so yes, they can handle it. I can't say about the second set of steppers, I have no knowledge of them. However, the price difference really isn't as big of a deal as it was even a year ago and for about $15 more, you can get brand new Kysans from Tridprinting and other places. These are new, and 76oz.in. of torque.
Regardless, I would HIGHLY encourage you to get a good, high torque motor for you extruder. In fact, I would even recommend you step up to a geared stepper motor and matching extruder. Something like the Mini Kossel extruder or Griffin Extruder will work with those. The Griffin extruder will work with both motor types. The alternative is to use a geared extruder. I always recommend gear reduction on nozzles .4mm and smaller.
For your power supply, in theory a 20 amp *should* work, however the Chinese use a form of new math that doesn't conform to reality*. So if you want a power supply like that for a heated bed, get a 30 amp. *Always assume it puts out about 75% of what they rate it at and you still want some to spare.
The Buda head works fine.
If you take the time and follow directions on how to assemble it, it can do some good prints. If there is a problem though, they can be a bear to work on. It's overly complex, can become hard to disassemble... There are simpler ways to do things.
Belts vs spectra... BELTS.
Belts, you can get a smaller pulley, and you get a known number to use for calibration.
Spectra is trickier than people think, this is because you have to be able to spool as much filament as your printer is tall. Because of this, Spectra will give you larger diameter pulleys, which means less fine detail, and a harder time calibrating, since you need an exact pulley diameter to calibrate steps per mm. Your printer size means you would need Cerberus size pulleys for your Rostock, not Mini Kossel pulleys if you want Spectra. It's also much harder to install.
