I designed this printer to get a very rigid and easy boxable construction without any too complicated mechanics.
I used many parts of my old Prusa i3 - so basically, it's an i3 with a 2020 aluminium frame inspired by Haeckel, and most of the Prusa i3 x or y-Axis parts will fit. This one uses 8mm trapezoid threaded rods with 17mm nuts, feel free to build it with any other i3 x-ends.
The X-carriage is a modified version of clefranc's Universal X-Carriage: http://www.thingiverse.com/thing:97719
Just added a small piece to hit the endstop switch.
I like ffleurey's direct drive extruder: http://www.thingiverse.com/thing:147705 download it there or use any Prusa i3 extruder you like, or use a bowden setup as shown in the second picture.
For endstops, I'm using some like these, or just be creative:
Print space (depending on extruder design) is 200x200x210mm, with enough clearance on x-axis to add a dual extruder. Anyway, dimensions are easy to vary by the lenght of the aluminium extrusions.
*Update 22 April '15: Some minor changes...
- clearance to insert TR8 Nuts
- made belt guides a bit wider
- made tensioners wider
- 3-way-connector is now more printable and has more clearance
*Update 19 Aug '15: Changed length of the extrusions. 430mm just wasn't enough for Y-direction!
*Update 09 Okt '15: Uploaded a new version of the bearing clips and a belt holder with tree holes for the printbed. Seems like the drawing I referred to was a quite old one, these should fit much better.
*Update 25 Okt '15: Added/modified the x-carriage, new picture
For frame Assembly, refer to Haeckel building instructions: http://reprap.org/wiki/Haeckel
Most of the rest is Prusa i3 stuff, just make sure that everything is assembled in 90° angles.
So how many parts do you have to print?
2 spool_holder (optional)
1 of all the rest
Stuff you need:
16 20x20mm aluminium extrusions, 450mm length (420mm will do for the 4 upright ones, but longer means higher build space).
~110 slot-nuts for the aluminium extrusions + bolts, or use standart M4 nuts with these instead: http://www.thingiverse.com/thing:1061769
2 ball bearings, SKF 623 (3x10x4mm) for belt idling
2 8mm leadscrews/trapezoid threaded rods, length ~340mm
2 nuts for leadscrews, TR8x1,5 SW17
4 smooth rods 8mm for x and y-axis, same length as the aluminium extrusions
2 smooth rods 8mm for z-axis, ~360mm long
2 Couplers 5 to 8mm for Z leadscrews to motors (Nema 17) OR use those leadscrew stepper motors.
1 Prusa i3 Y-Carriage
and things you use for any other i3, like stepper motors, GT2 belt + pulleys, lots of M3/M4 bolts + nuts, and electronics.
Also, dont't forget to print some endstop holders and extruder parts.
I'd be happy to see some builds!