Anything contour that stays within the bounding box defined by square and triangle projection lines will work. Blue is what OnShape generated. Red is what I’d force if I wanted.
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Also reprinting the horns from yesterday. Scaled down 50% with raft. Dunno what all that wispy stray fiber is. Too dry? From supports being printed coarse? PLA spool being not as good? Drip during travel?
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Done. Messed up a bit tried to make the triangle equilateral and the rectangle a square at the same time. Doh. No way to satisfy this template. If you have a square, triangle will be isosceles.
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The horns printed fine but that fuzz is a mess. Not sure it will clean up easy.
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After some cleanup. Not much better.
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Called on the brain trust for help.
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3d printing mavens… any tips for sanding PLA prints down to a smooth finish? @divalbanerjee @h_thoreson @chenoehart
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Much excite. Printing TPU for the first time. If it works I’ll be able to design my own tires 🥳😱
en.m.wikipedia.org/wiki/Thermopla
Just a simple rubbery washer to start with.
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Fingers crossed. Seems to be printing fine. Shiny with some stringing. Used Cura generic presets for TPU-95, whatever that is. Higher nozzle temperature (228F) but lower bed temperature (45) than PLA (205/65)
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Decent compliance, rather stiff at normal resolution printing with 60% infill. I bet I could get much wider range by messing with infill density. But clearly settings need work. But unlike PETG this feels different enough as a material, it’s worth mastering.
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Well finished printing a set of sample things. This comes out looking like the work of a deranged spider like in LOTR. Doesn’t have to. I’ve seen videos of clean TPU prints. Just have to figure out settings.
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Here’s a silent video of the slightly cleaned up parts undergoing basic inspection.
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Ok trying this dude’s settings now. His main thing is increasing the flow rate by 30% and lowering the speed to like a third, from 50mm/s to 18. Can already tell it’s working way better. Impressed. I gotta try this stunt with PETG too.
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Uh oh a bit of stringing has appeared. But much less than before, and likely due to the overhang geometry I’m trying… there’s a V-groove on the inner rim at 45 degrees
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Done. Some stringing and a bit of one skirt lifted off but overall looks good.
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This is vastly superior. It looks better without cleanup than the first one with cleanup. This is the “tire”
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In the second “tire” print, you can kinda see the groove there though black is a hard color to see shadows in. In previous print, it was jammed up in stringy goop.
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Time to get serious. Let’s try something that looks like a tire. 20% infill. Basically a spur gear with a shallow chamfer and large bore. If this works well I’ll design some treads.
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Lookin’ good so far.
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I think the inner v-groove in first tire was too aggressive. This one has a flat inside profile, but I suspect if I want a gentle concavity to fit a barrel-shaped hub, it'll work fine. The stringing was caused by the v notch. And I don't think supports are a good idea with TPU
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This turned out so beautifully I have a tear in my eye 🥲
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This is literally where the rubber meets the road, though TPU is not quite rubber :D
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I honestly didn't think I'd be able to get this right... I ordered several sets of toy wheels, expecting I'd have to buy rather than build, but my rover is going to have made-from-scratch wheels
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Btw turned out I didn’t need the mod part. That was for older model I guess. My printer does TPU without mods.
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Yesterday’s success with TPU inspired me to try PETG again. Tried TPU settings (slower movement, overextension) but that didn’t extrude stop all! Realized overextrusion is for soft filaments and PETG is stiffer than PLA. So dialed that back and just used lower speed. Worked ok.
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Some stringing but PETG wasn’t as bad as TPU last time do improvements with slower speed are less marked.
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3d printed art subthread
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Haven't been in the mood to work on my more complex designs/builds in a few weeks, so just to keep warmed up, decided to make a random art piece to test out freeform smooth curves. This inaugurates my 3d printed art thread.
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