Unresolved Filament keeps getting jammed - NEWBE

I assume you mean 1.75mm taulman 645 nylon?

So what are your print parameters (bed temp, nozzle temp, speeds, etc)?

645 is a bit harder to get right than some of the nylons, but I can attest it will print.

 

The best settings will be somewhere in this range:

Nylon 645
---------------------------------------------------------------------------------------------
Print temp = 250C - 255C
Nozzle = any size
Print speed = 80% of ABS speeds
Retraction = 1mm/.1mm nozzle or for a .5mm nozzle = 5mm
Print bed = Hot = Glass heated to 45C with coat of PVA

Hairspray on the bed works for me,with a 0.4 nozzle you want 4mm retraction. You might need a little hotter than that as well (maybe 260) start in that range though and see.

 

Is this the only filament type giving you issues?
PLA works OK?

 

Jamming/clogging is an odd one for nylon.
Make sure the nozzle itself is OK and that you can print PLA(or ABS) ok.
We need to isolate this to the filament or something else.
If PLA will print OK, but the nylon fails then we can tackle it from that angle.

 

What did? The Blue PLA or the Nylon?

 

When you print the 645 are you getting a hiss or steam the nozzle when it is extrurding?
It may be 'wet' (in other words has absorbed water). That nylon can absorb a lot of water in less that 24 hours (in other words: Nylon is very hygroscopic). Make sure you keep it stored with desiccant. They suggest drying it before use.

All that said ... I have been able to print it 'wet'.

Another point for most nylons is that they really don't like to stick to glass so I resort back to blue painters tape for them
While that is not you current issue I just want to go ahead and toss that out there.

Another well hidden setting is that you should use 60% of your nozzle diameter as a layer height - so ... with a 0.4mm nozzle you should print with 0.24mm layer height. Make sure the parts fan stays off while printing this (all the time). They want an environment of 30c but you can print it without a heated chamber if the room is not real cold and you keep the fan off.

 

You picked one of the pickiest nylons ... most of the others are not as hard to get going (ok, yes ... 280 is the worst).

 

Bridge, is the easiest it prints like ABS really (without the warp).

If you want all the advantages of Nylon without all the pain you can use Alloy 910*.
Also, instead of ABS you can use Bluprint (stronger, more heat deflection and easier to print).


*I really like 910. As easy to print as PLA, but much better material properties.

 

No,that is a loose thermistor. It is dropping temperature when the head moves.
Either that or the thermistor is damaged.

Either way it is a thermistor issue.

The firmware tosses that error when it sees the thermistor value drop during a print

Check the wires at the hotend and where they land on the RAMPS board..