Wades extruder feed jam when higher dan 220c

I'm using wades extruder with a homemade hot end.
When I print abs with a temp of 220c degrees there is no problem, but when I set the temp to 230 degrees there is no feed out of the hot end????

Has anybody an idea how to solve? where the problem could be?

Kind regards,Martijn

Hi Martijn,

can you measure the ral temperature of the hot-end?

When you overheat ABS it will carbonize and clogg with hard particles.

Another possible cause is softening of the filament in the entry so it's compresed, went thicker and the friction rises until stall ...

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Viktor
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I'll try to borrow a IR reader from my work, then I can measure the right temp hopefully.
On the peek i have constructed some small metal blades and a small fan to cool it down.

I'm trying to print the first layer with a higher temp so that it stick better...because i'm still waiting for kapton tape. I have a heated bed at 110 to 120 degrees with [www.kaptontape.com] which was available at my work but it doenst stick.

IR readers don't work well for objects with high reflectivity, you need to use a thermocouple!

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Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
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I've already measured with a multimeter, and that gives about the same temperature as the hotend itself.
Will measure again tonight.

The best way is to insert a thermocouple down the barrel and measure the temperature on the inside. You have to do it before it is used though. To get an accurate reading on the outside you need to strap it on with kapton to get a good thermal contact with the barrel and insulate the outer facing side, otherwise it reads low.

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[www.hydraraptor.blogspot.com]

I have measured it with a multimeter. And when i have set the temp to 200C it is about 215 to 220.
I Tried printing with about 220 degrees but in reality it is 240.

Will try printing with 205 degrees and tell you how it goes.

Edited 1 time(s). Last edit at 08/19/2011 01:03PM by martijnr17.

Actually this brings up a good question. How do you determine the optimal temperature setting for a given feed? I recently switched to a new roll of ABS from the same supplier and I had to increase the temperature setting from 230 to 240 C. A incorrectly assumed that they would be the same. Before I realized this, I broke a tooth from both gears in the Adrian extruder. Luckily, I printed spare gears a few months ago in case something like this happens.

Right now, I just manually push the filament to feel how much pressure I need to apply and I keep increasing the temperature until I can extrude. Then I connect the filament drive and gears and see how fast I can extrude to figure out my maximum flow rate. There must be a more quantitative way.

All the ABS I have come across will extrude above 200. I go higher to get good adhesion between layers and to get the first layer to stick. Must be odd stuff to be too viscous to extrude at 230C.

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[www.hydraraptor.blogspot.com]

The temperature for PLA is a lot more critical because it goes from too viscous to extrude to too runny to form a filament over about only 30C.

On the other hand I find typical ABS can extrude between 190C and 260C. The top end being limited by it burning / changing colour as it never gets too runny. Higher temperatures make stronger objects and sharper corners due to lower viscosity, but it also smells more.

I am not sure what Martijn's problem is as higher temperatures should not stop it extruding unless the cold end of the extruder is getting too hot. The entrance needs to be below about 80C for ABS and 50C for PLA.

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[www.hydraraptor.blogspot.com]

I have made a new hobbed bolt and printing goes better now.
It's frustrating that everything works but only the extruder or hot ends stops working.
Maybe is my home build hot end not good enough but i'm still waiting on the hot end from mendel parts.

I think i have solved the problem.
In my hot end the cold part was to hot. I have addes some extra coolsink plate and now the problem is gone for now.
The printer is now test printing PLA in everything goes okay at the moment.
I'm printing some extra gears for the wade extruder incase they break I have spare.

I'm very happy