colin

@vogon

the evil "Website Boy"

he/him
gameboat.org/

member of @staff, lapsed linguist and drummer, electronics hobbyist

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bluesky

if bluesky has a million haters I am one of them, if bluesky has one hater that's me, if bluesky has no haters then I am no more on the earth (more details: https://cohost.org/vogon/post/1845751-bonus-pure-speculati)

irl

seattle, WA

colin @vogon7/3/2022, 4:02 AM

colin @vogon

colin @vogon7/3/2022, 3:44 AM

spent most of the day installing a single-board computer in, klipperizing, and upgrading the extruder (from flsun’s stock BMG clone to a bondtech LGX lite) and part cooling fans on my delta printer, newly rechristened “triangle man”

nice to be able to print over the network to this thing, and it’s significantly faster and quieter, but there’s some pretty visible ringing even at 100mm/s with the extra mass of a direct drive extruder, which I’m hoping to be able to tune out with input shaping

#3d printing

colin @vogon7/3/2022, 4:02 AM

and the brains of the operation, ft. the extremely shady USB cable access hole I cut into the top cover with a pair of tin snips (don’t worry, the worst thing in there is 24 volts)

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in reply to @vogon's post:

colin @vogon7/3/2022, 3:51 AM

for anyone following in my footsteps, it looks like you unfortunately can’t get away with a really light traditional direct-drive extruder at these print speeds on a delta without cheating (i.e. having software dynamically detune the movements of your printer), and you do need to do something weirder like a remote direct-drive or a flying extruder or something

in reply to @vogon's post:

colin @vogon7/3/2022, 4:23 AM

also my favorite component in this whole build is the very silly 600V/25A terminal blocks I'm using as bus bars carrying 24V and like 0.6A

walking mirage @atomicthumbs7/3/2022, 8:54 AM

i love that everything in this world is subject to Resonant Overshoot whether it is a physical object, a signal, or any other somewhat damped system

colin @vogon7/3/2022, 2:34 PM

yeah it’s absolutely wild

I have no idea how it’s actually implemented internally, but there’s a test print you can run off to identify the resonant frequency/ies of your printer, and then enable input shaping to damp out those resonances at the cost of corners becoming less sharp

colin @vogon7/3/2022, 2:35 PM

I was running those test prints last night and at high accelerations the vibrations were bad enough that the extruder was rattling back and forth, but after enabling input shaping the rattle (and the majority of the ringing) disappeared

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