The Smell of Molten Projects in the Morning

Ed Nisley's Blog: Shop notes, electronics, firmware, machinery, 3D printing, laser cuttery, and curiosities. Contents: 100% human thinking, 0% AI slop.

Day: June 19, 2011

  • Bedbugs Redux

    Mary quite deliberately brought home a pair of bedbugs… even knowing what we went through, you cannot imagine how dead those things had to be. She doesn’t just want them dead, she wants them extinct.

    Anyhow.

    Some pix, atop a scale with 0.5 mm divisions:

    Bedbug - 4 mm - dorsal
    Bedbug – 4 mm – dorsal
    Bedbug - 4 mm - ventral
    Bedbug – 4 mm – ventral
    Bedbug - 6 mm - dorsal
    Bedbug – 6 mm – dorsal
    Bedbug - 6 mm - ventral
    Bedbug – 6 mm – ventral
    Bedbug - 6 mm - mouthparts
    Bedbug – 6 mm – mouthparts

    They were actually on load from Cornell’s Co-op lab, having recently been distinguished from bat bugs.

  • Thing-O-Matic: Multiple Bunnies vs Print Speed

    What’s more fun than one Stanford Bunny? A few litters!

    These at 50 mm/s feed came out a bit jittery. The ear overhangs were particularly messy:

    Small bunnies - ragged edges - 50-100
    Small bunnies – ragged edges – 50-100

    Another litter at 20 mms/s had better ear overhangs and much smoother coats with less overall jitter:

    Small bunnies - ragged ears - 20-100
    Small bunnies – ragged ears – 20-100

    The obvious shear line across their tummies came from my messing around with the HBP cabling, jerking the X stage while preventing the cables from snagging on the Y stage. Moral of the story: don’t mess around with anything inside the box while it’s printing!

    They have little droopy tails:

    Small bunnies - droopy tails - 20-100
    Small bunnies – droopy tails – 20-100

    I think 25 or 30 mm/s would be better all around, as it’d move the extruder away from the Z stage’s mechanical resonance at 1.10 rpm.