Depends on what you mean by good....
I have a Dimension BST, which is very old, but I can say for sure that the Dimension is a solid machine. We made our corner pieces for our frame out of 3-D printed material and the axle mounts. We were successful with both. I don't have access to my work computer today with the models of our corner pieces or the axle mounts, but I can get them to you later if interested. They were both designed to be attached specifically to 20 mm 80/20 extrustion (they held up to a pushing match with you guys in the eliminations at Lansing until we tripped our main breaker - that's what we get for using 4 Cim's and 4 mini-Cim's on the drivetrain).
The new Dimension Machines run about $15,000 and they are said to have material that is 25% stronger. But that always depends on how you use it. Loading is everything! Edit: (oh yeah the $15,000 probably fits into the too expensive category) Edit end.
We also have two Makerbots. Be ready to tinker with the Makerbots, they are good machines, but there is downtime associated with them and expect it to be a good learning experience.
I have just placed an order from multiple vendors for about $1200 in total of parts and should be able to make a MendelMax v1.5 with that. I will be assembling one over the summer and next year in my class we will be assembling a second one. I'm sure there will be a learning curve to it, but if you can build one, we will know the in's and out's of 3-D printing and that is the goal I have for my students. It should look something like this when done:
http://www.mendelmax.com/wp-content/...96fbaa5d9.jpeg
Also, check out Michigan Tech's website and the Square One Education Network. They have a program for teachers where they can go to Michigan Tech this summer and build a Delta Style 3-D printer. I believe they are booked. I was hoping to get a grant to put on another program such as that in Jackson, but I don't think the money is going to go through. For about $13,000 Square One Education Network will supply the parts and the expertise to set up another training and have 10 printers built in 3 days...
Here's the link to the Square One Education Network Professional Development
http://www.squareonenetwork.org/prof...l-development/
Let me know if you have any other questions.... And good luck next week!