Rostock 3D printer

jdolecki

Not wanting to be left out I've decided to build a 3d Printer

http://www.thingiverse.com/thing:17175

Martin_H

What are you using for the spherical bearings? Those seem like the most critical part of a rostock.

jdolecki

Basically they are just plastic ujoints with 3mm screws for axles.

There are a few built with the rod ends from rc trucks.

I will try it stock for now.

I would like to make all thebrackets in aluminum but I will see how the printed ones work.

Mark_T

The Geomag construction kits have a great solution to this issue, they have magnets embedded in plastic tubes that stick to ball bearings but allow rotation:
http://www.ebay.co.uk/itm/geomag-color-42-/261142345744?pt=UK_Construction_Toys_Kits&hash=item3ccd4bf810
The motion is pretty smooth and on excess force developing the joint falls apart (perhaps less damaging than the alternative, perhaps not).

jdolecki

Finished building the hot end. Its a combination of several styles I found on the web.

The 2 large holes are for the resistors and the 1 small is the temp sensor. The aluminum is .625 square I had laying around.

There are many examples of people using a brass acorn nut for a nozzle I will try that before i machine a nozzle.

Drilled a .039 (1mm) hole to start

jdolecki

Last week a video link was posted on the other forums I hang in showing how to make the feeder bolt.

I machined a fixture the hold the bolt and bearings to clamp it in my small mill

I used a 8/32 tap and applied cutting lube.

Here is the results.

I will get some more bolts and experiment with different taps and see which on works best.

jdolecki

Arduino Mega with ramps board plugged in on top. LCD panel with control knob.

prof_braino

Looking good!

vanmunch

Ya, very cool!

jdolecki

My filament extruder need work but it is making some parts.

My filament feeder need some fine tuning.

And I have begun designing a filament machine to extrude filament from raw plastic pellets because a roll of filament is sooooo expensive

Here is the cad of the prototype.

prof_braino

A guy in Chicago is offering $40,000 for a the first pelet extruder design.

http://inventables.blogspot.com/2012/05/40k-desktop-factory-competition-to-make.html

I don't think anybody has claimed the prize yet, I hope you succeed!