Any idea on why this might be happening? There is a smaller rod, similar to the one on the right, that is behind the big one that has the same issue.
Printed with the following:
Type: ABS
Layer height: .2 mm
Extruder temp: 220 c
Bed Temp: 100 c
Guess this is ABS and you print it without a heated chamber…
Try printing with oozeshield or skirt as high as the object, I’ve done this several times, it worked…
Best would be to print with better filament like PETG…
Abs?
Sorry, I was in a rush to get this out asked before I start mucking around and didn’t give any meaningful info. I just updated the original post with more info
That’s an infamous property of ABS. The further you get from the heated bed, the colder the air around the object being printed gets, so the faster it cools and the more likely you are to get delamination like this.
If you can, enclose your printer so the entire build chamber stays warm. Even sticking a big cardboard box over the entire thing can help.
@Stephen_Baird , that might have been it then. I had my active cooling fan turned on.
@Chuhue_Thao
Part-cooling fans are for PLA (which stays liquid longer). ABS should be allowed to cool very slowly and evenly.
Yeah, definitely turn off the cooling fan. You can use it on ABS on very, very small parts. But even then you should be careful. That might be enough to prevent this kind of cracking, I’ve seen it any time the ambient temperature is fairly cool, but a fan will definitely contribute too.
Yup. Tall parts will do that with abs. One of the reasons I gave up on it for my motorcycle hand guards. Petg would be a better alternative if you can’t get a heat chamber going.
You might be able to print a little hotter and slower? That might keep the layers from cooling faster than they cure? My delta is not conducive for heat chamber, so I had to 86 the abs.
Bump the extruder up to 240 Celsius. That’s what worked for me.
increasing extruder temperature 10-15 degrees C and not using a cooling fan should fix it - if not a cardboard box around printer to increase ambient temp / eliminate drafts and you’ll be set
If you built the printer & any of the load bearing parts are made of PLA, be careful enclosing the printer, they can go soft and deform (happened to me)
Honestly, you shouldn’t be making structural parts of any printer out of PLA. They’ll soften and sag in a hot car, they’ll do the same against any components that’s uncomfortably warm (but not painful) to the touch.
PLA is useful for many things, but not structural components of printers.
Good advice here.
Hotter and slower.
I assume you are printing one at a time.
You should also take care about how many perimeters and the % of infill you are printing.
i.e if you´re printing a 35% infill part with only one or two perimeters when the infill become to contract can tight the perimeters provoking delamination and/or that the lower part of the model caves in.
I think that 220ºC is not enough temperature to print ABS. Try about 235ºC.