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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Replying to
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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I HAVE CONQUERED TPU
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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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