This is my delta printer! The design is based on the Kossel Mini (lots of cred!) but everything is redesigned to fit my needs. I wanted it to print fast, look good on my desk and be fairly cheap!

Features (in addition to being a kossel/delta printer with what that brings):

• Very rigid (bottom and top corner pieces have been reinforced withmore supporting material and extra fastening screws + 2020 extrusions are used instead of 1515)
• Magnetic ball joints for minimal backlash and easy handling
• Wires are fed through corner pieces, looks neat
• Extruder is mounted on base extrusions so that the bowden tube can be packed together with effector cables.
• Nema 17 motor with planetary gears is neatly integrated in the extruder design, for performance and looks
• Effector, arm carriages and bed mounts are all designed to maximize the print height (which ends up in something like 275mm)
• Snap on Z-probe (see my other thing: http://www.thingiverse.com/thing:892398)

If someone is seriously interested in making this I'll be happy to help out as much as possible. If you want a list of links with all parts I have bought, just let me know. I sourced most of the non-printed parts from China, and I think the total cost ends up somewhere around 350 USD (depending on your choice of "expensive" parts; extrusions, linear rails, motors).

Overall it now prints great, compared to my Printrbot Simple Metal it is both faster and less noisy!

EDIT 15-10-12:

• Here is an updated effector that uses a 40mm fan to cool both hot end and the printed part: http://www.thingiverse.com/thing:1050490
• If you'd rather use ball joints (will never come apart, but might have some play) I have designed this: http://www.thingiverse.com/thing:1015846

Below is a BOM that should cover most of what I have used in my build. I have also documented where, and at which price, I have sourced the parts, so let me know if you are interested in that as well.

BOM:

General:

• 9x 240MM 2020 extrusions
• 3x 620MM 2020 extrusions
• 70x T-slot M3 inserts (I used 40 printed ones: http://www.thingiverse.com/thing:869163)
• 100x M3 Screws (10-20 mm)
• 100x M3 Nuts

Motion:

• 3x NEMA17 Motors
• 6x 10x3x4 Flanged bearings
• 3x 10x5x4 Bearings
• 3x MGN12 400 mm Linear Rails + Carriages
• 1x 5m GT2 belt
• 3x 16 Teeth GT2 Pulley (ID=5mm)
• 3x Omron mechanical switch

Extruder:

• 1x Geared (5:1) NEMA 17 Motor
• 1x MK7 Hobbed Gear (ID=8mm)
• 2x 623 Bearings (ID=3mm)
• 1x Spring
• 1x M4x20 Screw
• 1x M4 Nut

Effector:

• 1x E3D V6 / V6Lite
• 6x Carbon rods L200, OD6, ID4
• 12x 10x4 or 10x3 magnets
• 12x 10x4 or 10x3 countersunk magnet
• 12x 10 mm bearing balls

Bed:

• 1x 180mm borosilicate glass bed
• 1x 180mm silicone heater pad
• 1x 180mm IKEA cork pad

Electronics

• 1x Arduino Mega
• 1x Ramps 1.4 + Stepper drivers
• 1x LED style power supply 12V

PRINTED PARTS:

• 3x LOWER_CORNER
• 3x UPPER_CORNER
• 3x ARM_CARRIAGE_FIXED_4mmMAGNETS or ARM_CARRIAGE_FIXED_3mmMAGNETS (depends on your magnet height)
• 3x BED_MOUNT
• 1x EXTRUDER_1
• 1x EXTRUDER_2
• 1x EXTRUDER_3
• 1x EXTRUDER_KNOB
• 1x EFFECTOR
• 1x EFFECTOR_TOP
• 12x ROD_END
• 1x SPOOL_HOLDER
• 3x EXTRUSION_COVER
• 1x PROBE_MOUNT (not necessary)
• 1x EXTRUDER_WASHER (not necessary)
• Xx T-SLOT_INSERT (not necessary)