Conversation

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
1
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
Success Kid Is Successful! GIF
GIF
1
7
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.
Image
2
1
Well this failed halfway through, running about 5 degree hotter. The piece detached from the raft. 🤔 Let’s try slower and cooler.
Embedded video
0:02
267 views
1
Comparing failed hotter print (220 instead of 215 or 210… sloppy records), I think I’ve confirmed hypothesis that hotter = more stringing. So@e sort of impurity has snuck into failed print. Either the filament burned or sine foreign stuff. Rafts look similar.
Image
Replying to
Ok, slower print failed faster. Maybe I’m going too slow? Again detachment from raft… but happens without raft too 🤔😢
Image
1
Microscope on impurity and close up of successful vs hot print. I’m thinking my one successful print was just luck.
Image
Image
1
Good thing to try... will try this tomorrow
Quote Tweet
Replying to @makeshiftsavant and @vgr
I was able to fix all of my issues with bed adhesion by lowering the first layer so more first layer material gets pressed into the bed and makes a cohesive first layer, but with PETG that might be trickier. Good luck.
1
1
Need to set bed temperature higher, lower the fan speed or turn it off, and maybe mess with first layer settings. Most people have over-strong adhesion problems, not weak adhesion. This needs a spreadsheet.