Problem with delamination

JamesM

If you are using the standard V6 heater block on your chimera then you are trying to print too fast for how much plastic you are extruding. The standard V6 heater block is rated around 15mm^3/s max which can be overcome a little bit by raising temps higher and with the speed and layer heights you listed you are trying to print 22.4mm^3/s worth of plastic.

Also general rule of thumb is the line width should be at least 1.2x the nozzle width since with molten plastic it wants to flatten out when printing so by forcing it to remain at the same width as the nozzle you are under-extruding and not allowing good layer bonding.

Basically, you need a Volcano heater block if you want to print as much plastic as you are to print reliably.

Phaedrux

At your current height, width, speed combo you are trying to push 22.4mm^3/s which on a V6 is not likely to do well. On a volcano you'd be in range. Super volcano even better.

Based on your values and assuming a safe limit of 12mm^3/s for a V6, your print speed should be closer to 27mm/s.

But to really get a good idea of your max volumetric flow you must profile your extrusion system. See here:

https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+4:+Calibration/40#s165

Thalios

Thanks for the pointers. It makes sense.

I will look into either slowing it down or getting a smaller nozzle (which would suck because it's a NozzleX at 50$CDN)

Veti

@Thalios said in Problem with delamination:

I will look into either slowing it down or getting a smaller nozzle (which would suck because it's a NozzleX at 50$CDN)

you could get a mosquito hotend, you can use the standard nozzles with it.

https://www.sliceengineering.com/collections/mosquito-the-professional-hotend/products/mosquito-magnum-hotend

The Mosquito Magnum prints upwards of 30 mm^3/sec

Thalios

Well I have the Chimera+ on it, which I paid lots of $ for. would suck to toss that away.

Phaedrux

Well you're only printing at 220c. Try 260c and see what kind of a flow rate you can get. Getting close to 50mm/s should be possible.

The layer height is also quite high. Try a layer height of 0.4 and an extrusion width of 0.82.

That would get you to 40mm/s and the lower layer height and higher temp should help a lot with layer adhesion.

And if you do the calibration of the extruder as in that link you'll be able to find out your actual limit, which makes figuring out the optimal values a lot easier.

Veti

@Thalios said in Problem with delamination:

Well I have the Chimera+ on it, which I paid lots of $ for. would suck to toss that away.

well then go with jamesm idea and get a volcano heater block

https://e3d-online.com/products/volcano-upgrade-kit but you can use your nozzle

jens55

Going from 220C to 260C would be ok while you are printing a high volume but what would happen if you are printing a section that requires a lower volume of filament? Seems to me that this is just asking for other issues down the road. Maybe 10 or 20 degrees higher but 40 degrees ?

BTW, I use a Chimera (clone) and a Volcano (clone) heater block but even with that, I think 22 mm^3 would be asking a lot. It's been a while since I have done high volume printing so I am not betting my life on it but I seem to recall that I set my limit to 20 mm^3 (without tweaking the heat of the nozzle)

Thalios

@Veti The Nozzle for the Volcano is different, it has longer threads.

I'll try Phaedrux's idea of increasing temperature.

On a side note though, the plastic does come out super easily when printing at these speeds. It works great for smaller prints and for the first 3-4 layers. It'S the walls that are not sticking.

I'll try some of these answers tonight and will report back.

Veti

@Thalios said in Problem with delamination:

The Nozzle for the Volcano is different, it has longer threads.

yes i mistyped

Thalios

Well I followed a bunch of these recommendations and you know what? Success! The print is very clean and very solid.

I slowed down to 40mm/s
increased to 0.82mm layer width
Slowed fan to 25%
Layer height at 0.52mm
Temp at 225°

theruttmeister

Even at 0.82 EW you are running a ratio of around 1.4.

I would strongly recommend that you never go below a extrusion width / layer height of 1.6
It will print, but increasing that ratio increases inter-layer bonding strength and hence overall part strength.
2:1 is a great rule of thumb. Really high ratios become a problem for other reasons.