NASA 3D Printed Wrench
To test out my new Lulzbot Mini i printed the Nasa 3D wrench.
It ratchets in the clockwise direction only but it prints as a fully functioning part. It’s stronger than the rated 3in-lbs.
It wasn’t all plain sailing though, this being my first ever 3D print, it was a good learning curve.
I didn’t fully print all of these, i could tell early on if it was going to work or not.
| Material | Fillament Dia | Layer Height | Flow | Infill | Result |
|---|---|---|---|---|---|
| ABS | 2.85mm | 1.8mm | 100% | 20% | Fused solid |
| ABS | 2.85mm | Std Print | 100% | 20% | Fused solid |
| ABS | 3mm | 2mm | 90% | 25% | Works, slightly loose |
| ABS | 3mm | 1.8mm | 100 | 25% | Fused solid |
| ABS | 3mm | 1.8mm | 95% | 25% | ? |
I was having a tough time getting these off the print bed. First layer adhesion was too good. So i reduced initial layer line width to 115% which struck a nicer balance of security vs. easier removal.
So it seems my Lulzbot mini over prints very slightly. Upping the fillament diameter helped but did not fully resolve. I measured the fillament at between 2.80mm and almost 3mm in some sections.
I measured the infeed and found a 10mm command produced a 9.95mm feed.
With 20% infill i can’t break the handle with hands alone. The square peg fails easily by splitting a layer. Tolerance of square peg is tight, even with set to under extrude.