This is based on MendelMax J-Head Micro-Extruder V5 but completely rewritten in OpenSCAD and slightly modified for Kossel:

* Two 623 (3x10x4mm) bearings to support the drive gear, attached with M3x20mm.
* 16mm GrooveMount (compatible with J-Head and MakerGear).
* M4 mounting screws, 50mm center-to-center.
* Hotend exactly centered.

Rostock is a delta robot 3D printer.

This part can hold a MakerGear PEEK insulator (GrooveMount) and a bowden tube with 4 mm outside diameter. The M8 nut allows adjusting the clamp pressure so that the bowden tube won't pop out.

Newer versions of the OpenSCAD source files will be published here: github.com/jcrocholl/rostock

This is a printable jig to make really precise top and bottom plywood frame parts for the Rostock delta robot 3D printer.

This jig is designed to work with plywood pieces of 350x300 mm. You may be able to drill both (top and bottom) at the same time.

12 mm (or maybe 9 mm) thick plywood is recommended to make the frame as strong as necessary. 6 mm thin plywood may be okay if your plywood is very good, and you are planning to make a back/side frame anyway, or if you are building a mini Rostock.

Rostock is a delta robot 3D printer.

This part is the vertical carriage for LM8UU and universal joints to attach two diagonal rods.

Newer versions of the OpenSCAD source files will be published here: github.com/jcrocholl/rostock

Rostock is a delta robot 3D printer.

This part is the top bracket that holds a pair of 8mm smooth rods, two ball bearings, a micro switch (endstop) and a plywood board.

Newer versions of the OpenSCAD source files will be published here: github.com/jcrocholl/rostock

Rostock is a delta robot 3D printer.

This part is the bottom bracket that holds a NEMA17 stepper motor, a pair of 8mm smooth rods and a plywood board.

Newer versions of the OpenSCAD source files will be published here: github.com/jcrocholl/rostock

Rostock is a delta robot 3D printer. It uses 6 of these diagonal rods. The first version was using carbon tube and ball joints, but now these rods use universal joints and are fully printable.

Newer versions of the OpenSCAD source files will be published here: github.com/jcrocholl/rostock

Blog with project history: deltabot.tumblr.com
Videos: youtube.com/user/jcrocholl/videos?query=rostock
More pictures: flickr.com/photos/jcrocholl/tags/rostock
More details about parts: thingiverse.com/tag:rostock
OpenSCAD source files: github.com/jcrocholl/rostock
Documentation: reprap.org/wiki/Rostock
Ask questions here: groups.google.com/group/deltabot

Rostock is a delta robot 3D printer prototype with the following design goals:

Build volume: 8x8x16 inches or 200x200x400 mm
Footprint: 12x14 inches
Print surface: 8x8 inches heated glass which never moves
Mass of end effector with two hotends: less than 150g
Positioning speed: 800 mm/s in all 3 directions
Positioning accuracy: at least 30 steps/mm in all 3 directions
Simplicity: fewer than 200 parts (not including washers, nuts and SMD-mounted electronics)
Hardware cost: less than $500 USD

Inspiration: search YouTube for "flexpicker" or "adept quattro".
Closest ancestor: heliumfrog.net63.net/deltarobot/delta.html

Early concept for a fully symmetric belt-driven extruder carriage for upgrading Prusa Mendel. Belt-driven means there's no stepper motor on the X-carriage, so it can be much lighter and move much faster.

It has two X-belts that are controlled by one stepper on each side.

If both belts move in the same direction, the X-carriage moves in that direction too. If both belts move in opposite directions, the extruder moves but the X-carriage stands still.

x_motion = (stepper1 + stepper2) / 2
extruder = (stepper1 - stepper2) / 2

We'll need new firmware to control x_motion and extruder independently by setting the correct speed for each stepper motor for the two belts.

stepper1 = x_motion + extruder
stepper2 = x_motion - extruder

This design attempts to reduce the effects of the torque that's required to move the extruder:

* It is based on the excellent VertX (vertical x-axis) by watsdesign with LM8UU linear bearings: thingiverse.com/thing:10711
* It uses a pretty large timing belt pulley on the back of the carriage.
* The two belts are entering the carriage very close together and perfectly parallel.