Lawsy Carriages (printed parts)
Linear Bearings
New Hardened smooth rods (the bearings will eat the stock rods very quickly)

the Hale heatbed is AWESOME! and well worth the cost

i would suggest a bed stabilizer on the front... dual Z can be problematic in its own right

I purchased a solidoodle 4 used and pretty much stock (previous owner put in a V6 and abandoned the second extruder).  I'm having trouble with mechanicals on this so I'm going to break it down and I plan on spending too much money to completely upgrade this beast.  I have a solidoodle 3 working to help with parts.

It is my hope, if I do this the way I want, is that I end up with a solidoodle with only a frame and platter that's original.

My hope is that I can make a machine that can work with those cool water soluble plastics for support.

I would like ideas for best mods that will make this a beast.  I'm going to use this to help build custom parts for things like superheros.  I've got a partner that makes the costumes and I'm to print the parts that are best done with 3d printers.

In addition I'm an engineering teacher at a low income school and I've got several teams of students that I suggested that we could build 3d printers from scratch.  I'm a big fan of the Cartesian design of a solidoodle and look to design from that.  The only big design change I plan is to use dual z screws.  This is the direction I will push my student teams, but they will ultimately make these decisions individually as teams