Rostock MAX
Release status: experimental
| Description | Rostock MAX is a delta robot 3D printer based upon Johann's origional.
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| License | |
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| CAD Models | Coming Soon
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| External Link |
Contents
Introduction
Rostock MAX is based upon Johann's origional Rostock Delta Printer Prototype. It features T-Slot extrusion for the linear motion ( cheapskate ) and laser cut acrylic OR plywood framework. The lower wrap piece around the bottom hides the electronics, but it's removeable to show off all the acrylic/plywood and electronics if you want.
Photos
250px
250px Concept for triple hot-end
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Videos
Bill of Materials
>>> This B.O.M. is expected to be completed and revised sometime the first week in October, 2012. <<<
| Rostock MAX B.O.M. | |||||
|---|---|---|---|---|---|
| Qty. 9 | 608ZZ Ball Bearings | The best you can source | |||
| Qty. 1 | One Set of Laser Cut Parts | File:ROSTOCK MAX BY SEEMECNC INITIAL RELEASE OPEN SOURCE.zip | |||
| Qty. 16 | M3 x 10mm L Pan Head Phillip | nema motor mounting screws | |||
| Qty. 4 | Nema 17 Size Stepper Motors | four wire steppers | |||
| Qty. 3 | 1" Square T-Slot (25mm) x 32"inch (800mm) long | regular aluminum t-slot | |||
| Qty. 3 | 15T Idler Pulley | GT2 2mm pitch timing belt pulley | |||
| Qty. 3 | GT2 2mm pitch x 1900mm L timing belt | neoprene works fine | |||
| Qty. ? | 6-32 Ny Lock Nut Stainless | 3mm or 3.5mm can be used instead | |||
| Qty. ? | 6-32 x 1"L Phillip Flat Head Screw Stainless | 3mm or 3.5mm can be used instead | |||
| Qty. 24 | 1/4-20 Button Head Screw x 1/2"L | 6mm x 12mm L Screw for metric | |||
| Qty. 24 | 1/4-20 t-slot nut (ebay) | use 6mm or proper metric size for 25mm t-slot | |||
| >_ | >_ | ||||
| >_ | >_MORE PARTS REQUIRED TO COMPLETE | ||||
Electronics
RAMBo by UltiMachine is what is being used on the prototypes. RAMPS 1.4 has been used by Johann and others on the original which has the same requirements. You only need 4 stepper drivers, 6 limit switch inputs, and two heating circuits so any board capable of those requirements should be acceptable.
450W ATX PSU is used to run all electronics, the lower acrylic panels have mounts for a standard ATX PSU, as well as RAMPS 1.4, RAMBo and universal mounting holes for other electronics.
Firmware
The Rostock MAX uses the same firmware as the origional Rostock. It can be found Here. It is Marlin, with the Delta positioning so that any standard host can send X Y Z E moves to the board, using standard Gcode, and the firmware interprets the delta math to move the platform. Rod length and sin/cos are defined in the marlin.pde file, this is where the movements are calculated based on these values.
Assembly
STEP 1 ...
Motors
The Rostock MAX uses 4 NEMA 17 stepper motors. There is one motor for each of the three delta arms, and one for the extruder. You can substitute NEMA 11 thru 17 motors on the extruder, but the arms need more torque to lift the carriage.
Motors used in SeeMeCNC kits are
42BYGHW811
Other motors that should work well are
42BYGHW804
If you use other motors, be sure to list them and their performance here please.
NEMA 17's uses M3 X.5-10mm mounting screws.
Endstops
Currently, there are 6 endstops used for homing the delta arms. One on top and bottom of each arm. Changes are in the works by Johann to eliminate the bottom endstops, as the tops have micro adjustments already, so no need for the lower adjustable endstops.
Belts and Pulleys
Uses 74" long (~1900mm long) GT2 2mm pitch x 6mm wide belt. You will need three of these belts, one for each arm. Original Rostock uses 40 tooth pulleys, we are using 15 tooth machined aluminum pulleys on the prototype to increase torque and positioning accuracy.
Calibration
Slic3r Settings
The following settings were used to calibrate retraction on the hollower pyramid thing at http://www.thingiverse.com/thing:29429. Filament used was Makerbot 1.8mm Silver ABS. Use these settings for a good general baseline for printing. You can increase the print speed, but you may need to increase hotend temps as you increase speed above 35mm/sec. 235C+ is looking to print well at 35mm/sec speeds
.3 layer height
2 perimeters
0% infill (hollow)
30mm/sec speeds for everything except for external perimeters at 80%
300mm/sec travel speed
228C extruder temp
slow down if print time is below 25 seconds
minimum print speed set to 6mm/sec
10mm retraction @ 55mm/sec retraction speed
0 Z lift
0 extra length on restart
3mm minimum travel after retraction
Further reading
- "Rostock Derivative", another RepRap built from extruded Aluminum in the Rostock arrangement.
