250mm³ 3D printer, designed and made at FabLabSantander®, coreXY. Try to be as cheap as possible. You can download 3D design (FreeCad) and OBJ files to 3D print here.
License: CC-BY-SA :
BY: Licensees may copy, distribute, display and perform the work and make derivative works and remixes based on it only if they give the author or licensor the credits (attribution) in the manner specified by these.
SA: Licensees may distribute derivative works only under a license identical («not more restrictive») to the license that governs the original work. (See also copyleft.) Without share-alike, derivative works might be sublicensed with compatible but more restrictive license clauses, e.g. CC BY to CC BY-NC.)
Building CorocottaV2
Bill of Materials
Wood (Medium Density 10mm) assembly:
Prepare the assembly with tape 
We use 3mm wood screws. Drill 2mm and 3mm holes before !
The wooden plates screwed:
Mounting the corners (for motor and pulley holders)
Drill 4mm holes and tap to M5, to hold the corner: 
mount the corner 
mount the corner
Just like the big box, drill 2mm and 3mm holes to fix the 3 plates in a square:
Building the vertical guides and bed support
Carefully trace the vertical lines at 150mm for symmetry axis
Use M6 screws (drill 5mm diameter holes before). And tap with M6 the 2 top holes.
Mounting the bed guides
Refresh the 5mm hole
Trick: wet the tap before!
Tap M6 thread
A M6 screw hold the slider
Mount bed holder. You may have to unscrew rescrew to get the system find its place.
Mount the Z nut holder
Drill 5mm holes for Zscrew holder
Tap M6 thread
Insert theM8 nut
Fix it with 2 M6x16 screws
Z nut holder mounted
Mount the Z stepper holder with M6x16 screws
The stepper motor is mounted with 2 M3x8 and 2 M3x15 screws
The bed and Z system mounted in the printer box
Mounting the pulleys of the XY system
The 2 blocks holding the pulleys
Place a washer, a bearing, another washer, the special 3Dprinted washer and another bearing in a M8x35 mm screw
Place the screws for fixing the corners
Place the 4 M5x16 screws 
M5x16 hallen screw
Mount the steppers
Fix the nema17 stepper with 4 M3x8mm screws. Don’t forget the pulley ! 
M3x8mm
Mount the whole XY system
mount the 8mm bars and the Y sliders
place the XY system
Place the taps
Mount the spacers of the X axis sliders
Use M8x50 screws
It’s better to use M8 «nylstop» nuts
Mount the head plate
the Jhead extruder has 10mm screw for Teflon tube, conveniently used to fix on the plate 
Screw the head plate with M3 screws
Belt grip
Mount the feet
Drill 5mm hole and tap for M6 
Use M6 x16 screw
Mount the bed
Drill 3.5mm hole in the aluminium profile 
Drill 2.5mm hole in the bed square 
Mount a 3mm screw, washer, spring and another washer 
The glass bed can be glued with double-face tape
Mount the bowden extruder
Mark the place 
Fix with 4mm wood screws after drilling 2,5mm holes 
The extruder mounted
Place the screen and main switch
unmount everything for painting ! 
painting … 
painting …
To be continued ….