Hi all.
I’m interested in MBot 3D Printer Plywood Kit dual head. How about this machine ? I had tried to search about this machine but I could find just a few things about it. Is it OK for newbie ? Thank for all comments.
The MBot machines are MakerBot Replicator clones. Given the troubles that others have had with their own MakerBots, I suspect you’ll have even more trouble.
I was going to say the same as @ThantiK Basically early Makerbot machines (the MBot ones are clones) are much much heavier on the “you need to learn a lot to use” kinds of things. Something like the Affinia (http://www.makershed.com/products/afinia-h480?gclid=CLSNlJKE4b8CFcI-MgodwzIA3A) is more plug and play (for the same price as that Makerbot clone).
So the real question is what are you interested in? Printing things? How to take 3D models and turn them into plastic? or How to use stepper motors to squeeze plastic out of a nozzle and make shapes?
If you are just interested in printing things, get an off the shelf printer and focus on learning Blender or Rhino or Solidworks, and translating that into printable stuff on the printer you bought.
All the clones also have the PTFE tube in the extruder which leads to eventual problems - Makerbot Reps have the all metal extrusion path
Of the Makerbot clones, Flashforge Pro looks good - prints a wide range of materials, two extruders, metal build platform, etc., and runs Sailfish firmware. Basically an open Replicator 2x, with the community mods built in. The only thing I don’t like is the PTFE tube in the extruder, so you can’t go over 240 or so.
@Laird_Popkin 266C actually for PTFE. 240C is for PEEK insulators.
from what Ive heard (no first hand experience) the PTFE degrade over time when you go above PLA/ABS print temperatures - it’s not a sudden fail, its a gradual fail
I’ve been printing for close to 4 years now, and my old J-head MK-IV-B is still rocking out, never replaced the PTFE liner. It’s a 2 1/2 year old hot end IIRC… where did you hear this?
http://forums.reprap.org/read.php?1,65051,201675
The pyrolysis of PTFE is detectable at 200 °C, and it evolves several fluorocarbon gases[10][11] and a sublimate. Animal studies indicate that it is unlikely that these products would be generated in amounts significant to health at temperatures below 250 °C,[12] although birds are proven to be much more sensitive to these decomposition products.[11][13]
So it’s probably okay up to 260 or so, but best to keep a safety margin.
OK - I will defer to your experience. 
Seems to be the consensus on the 3D tips & tricks GG (at least in regards to the Chinese Makerbot clones). I dont have one, so I havent had any first hand experience.
I’m over 1000 print hours on my Replicator dual clone (CTC) and approaching 700 print hours on the other clone (FlashForge). So far no clogs and no issues relating to the PTFE liner.
Yes, at ABS or PLA temps PTFE is great. It just means no weird hi-temp materials.
Mbot looks very good. It’s PLA only, I believe.
Thank for all comments again.
@ThantiK @Chuck_McManis That mean if I want to learn about 3D printer this machine is OK but I have to learn a lot to adjust it ? I’m interested in this machine because 1. It’s a DIY kit. 2. It’s 550$ I think it quite cheap for dual extruders.
@Laird_Popkin They said It can print both PLA and ABS. But It need heatbed.
And How about Replikeo Prusa I3?
@Orion_Stargazer Three things.
First, cheap versus expensive. As someone who has also been involved in personal robotics for a long time the costs are high. However when people try to learn using cheap tools, it makes the learning harder because you don’t know which is wrong, what your trying to do or what the tool is doing with it. The only way to resolve that is to eliminate variables. You might look for a class nearby at a school, a club, or a maker space they will have a known working printer setup and so you can focus on fixing what you are doing wrong when things don’t print. And there will be people to help with common questions etc.
Second, since a lot of people with more money than time seem to buy printers, you may be able to find someone who is willing to sell their unused or lightly used printer for less money, but one that has a wider installed base (so more folks online to help)
Third, if you want to be a complete master, then the best path is to start at the beginning. That means getting tools to build a RepRap type machine, starting from there and then working your way up to something like a Mendel90 or a Prusa. Conceptually 3D printers are very simple, but the challenges are subtle (and inordinately focused on the hot end of the extruder it turns out).
Sure, it can extrude ABS, any printer can, but without a heated bed and enclosed build area, it’ll be unusable except for small objects.
@Chuck_McManis Thank you for you suggestions very much.