Beispiel der praktischen Anwendung eines 3D-Druckers

„Schnell, schnell! Wir brauchen noch ein wunderbares und nicht käuflich erwerbbares Geschenk für Mama, Papa, Opa, Oma und meine 2 Geschwister. Alles individuell auf die jeweilige Persönlichkeit zugeschnitten.“  …tjaaa, da wird’s meistens schon etwas eng mit der Geschenks Auswahl.

Aber zum Glück sind viele Leute kreativ und können sich dafür etwas ausdenken. „Heureka!“, ruft dann der erhellte Geist und verweist einem auf den Vorschlag, man könne doch kleine Skulpturen der jeweiligen Lieblingstiere schenken (ich selber sammle seit Kindesalter allerlei Figuren von Schildkröten). „Super Idee, Gehirn. Aber wie soll ich das anstellen? Wie soll ich meine Idee in die Praxis umsetzen?“

Und hier kommt der Realraum ins Spiel! Hackerspaces dieser Art sprühen geradezu nur von Kreativität und Handlungsdrang, vor allem wenn sie so gut ausgestattet sind wie wir ;)  Ob Holzgeschnitze, sämtliches Gedrähte (also Draht) zum Biegen und Löten, dünne Holzplatten, verklebbare Teile oder individuelle Kunstwerte aus Plastik,…mit unserer Werkbank, dem Lasercutter oder dem 3D Drucker sind die Möglichkeiten mannigfaltig. Wer noch ungeübt ist mit dem Umgang jener Gerätschaften kann sich natürlich Hilfe von den Mitgliedern holen, besser 3x nachgefragt als 1x kaputt gemacht.

So hat man schnell das passende Geburtstagsgeschenk gefunden, in dem Fall mit dem 3D-Drucker selbst erstellt. Wer der Meinung ist, wenig Zeit oder nicht kreativ genug dafür zu sein (so wie ich :P ) kann sich genug Models und Vorlagen aus dem Internet holen.


Lulzbot TAZ4 @realraum

Thursday we unboxed our highly anticipated TAZ4 #3DPrinter, which we won as part of the #LulzBot 4th Annual Hackerspace Giveaway.


It rulez !! :-)

We have a very coloured history when it comes to 3D printing. Ever since we ordered the first parts for our self-built RepRap Mendel years ago, 3D printing was something you did not mention easily at realraum.

The RepRap was built, rebuilt, adjusted, taken apart, modified and hacked, again and again. All with mixed success. While we did learn a lot about 3D printers in the process, likely spent more than 300 man hours on it and even wrote a big TeaCup firmware patch, the thing probably only ever spent a sum total of 2 weeks out of 5 years in a state where it could actually print, badly! Most of the time however, nobody knew who last took apart what or was planning to improve which thing next.

Then came the MakiBox. Co-sponsored by one of our founding members (who resided in Hong-Kong at the time and co-founded DimSumLabs there) Always on a tight budget, this first-of-the-line production model seemed the perfect way to finally make 3D printing a reality here at realraum. Especially since said founding member was sponsoring it. In its defence can be said, that, frail as the design was, it did actually print in the beginning. Unfortunately that state would not hold very long. We then decided not to review the MakiBox, as we were missing the words to describe just how crappy it really was.

Again, 3D printing was not mentioned at realraum for about a year.

Finally, along comes the Lulzbot TAZ4.

After just a few days it may be a bit much to say “Lulzbot rescued 3D printing for us”, but that’s about what it feels like right now.

It has a large print area and is capable of very fine and precise prints. It follows all best-practices I’ve ever read about making 3D printers. E.g. it has a heated glass-surface which is perfect for PLA. Beyond that, you might even accuse Lulzbot of over-engineering. Looking at the industrial grade cable connectors, screws, bearings and shaft couplings, you know they didn’t skimp on the parts. Next to that is ships with a bag of quality tools which even includes a jar for mixing ABS and Acetone.

comes with ALL the tools

Our first test prints came out very well. Even when stress-testing with our crappy old PLA roll, the prints came out very nice. The nice fan and air-guide works just as expected and overhangs printed without problems. Using rafts, even delicate and complex prints with little surface area came out fine.

To show off the printing process (and experiment with gstreamer), we mounted a webcam on the platform, the resulting time-lapse videos can be found in the gallery.

It does have its hard edges, but this printer is not meant to be super-user-friendly and DAU-resistant. Instead it is hackable, open-source and a precise straight-forward work-horse. Just how we like it! Despite our hack-at-it attitude, we _did_ appreciated the big and surprisingly useful user-manual as well as the handy illustrated first-steps flyer.

and ALL the instructions ;-)

All in all, the printer gives manages be at once a highly professional machine as well as a matured hackable open source project.

Of course, it would not be bitchy us, if we didn’t find anything that could be improved. Most of that can be traced to the firmware: The sampling of the rotary encoder for once feels sluggish and imprecise even though the encoder itself is high-quality. We also wonder if the forces reset on sd-card change and usb-cable plugin is really necessary. Finally, it’s OK that the printer does not print from SDcard when still connected by USB, but it could display a warning instead of just plainly doing nothing after one selects “start”. Also the resonance frequencies of the printer could have been measured and the firmware modified so it would then avoid certain of those speeds and direction changes. Since it’s all just software, we may actually do something about that in the future :-) On the hardware side, we noticed that the power supply’s cooling fan would still run long (hours) after the printer had been switched off. (Note: the only big off switch is on the DC voltage side of the printer). Not sure if that fan actually ever stops.

All that (and on the bitchy side: the fact that it’s just that) really really shows just how much experience and know-how (hard won over the years of DIY 3D printing I’m sure) went into making the TAZ 3D Printer. Thanks #LuzlBot !!

first success with PLA: enclosure for our biohazard alcohol breath-o-meter
Biohazard Breath-o-Meter