Got any pointers on the Bowden Extruder?

[lazerusrm]

Fan? I forgot to even get into that problem. to use a fan successfully and reliably, i had to insulate the hot end from the fan, otherwise it would cool off too much.

You should be able to print just dandy without a fan for many things, as long as the parts are not super tiny. Lower the temperature some.

My hotend is insulated with Hi-Temp Stove and Gasket Cement that i bought from the local hardware store. Once heated it forms a ROCK HARD insulation layer around whatever you put it on.. but beware, if you ever have to replace

anything, you must use a new thermistor as the leads snap right off. (done this twice now) i just ordered my 3rd set of thermistors etc for the next time i break them.

Right now my fan setup is just cobbled together as i have been SLAMMED with work.... but this is what i used...

http://www.thingiverse.com/thing:28412

But instead of mounting it flush, i used a longer bolt and threaded it into one of the far end holes on the cheap skate, and right now am just using a peice of masking tape to prevent air from being blown over the hot end. this seems to

work fairly well. its light enough it has no effect on the print.

I'll have to post a video of a print. maybe i'll take one as soon as im done printing this case ( ETA 5 seconds...) !

[fredini]

First Successful Print!
[img]http://farm9.staticflickr.com/8183/8369756704_78c601de30.jpg[/img]
Red Rostock Max Katie vs. Printrbot + Katie prints #3DPrinter by fredini, on Flickr

[img]http://farm9.staticflickr.com/8233/8368881739_15957b436c.jpg[/img]
Rostock Max first Print by fredini, on Flickr


Rostock Max Print vs. Printrbot+ prints:
[img]http://farm9.staticflickr.com/8334/8369756932_e7870b40a4.jpg[/img]
Red Rostock Max Katie vs. Printrbot + Katie prints #3DPrinter by fredini, on Flickr

[lazerusrm]

share more details of your print!

Temperature

Slicer

Speed

Slicer Settings?

[fredini]

Some more prints and some settings today.
I had a couple instances of printing failures- The settings are more or less the same as the settings below. On all prints I am running a small fan just setting next to the printer after the first couple layers.

First I had a print that I aborted- the machine took a weird jog in the x and y. I know it was previously suggested that this could be something overheating in the Rambo Board, but I'm also wondering if I have some kind of loose connection with one of the wires that connects to the Board.... not sure.
[img]http://farm9.staticflickr.com/8499/8373997254_5b46c4bb47.jpg[/img]

[img]http://farm9.staticflickr.com/8464/8372926355_5b737cbd7e.jpg[/img]

The print after this was the one I previosuly posted - a 122mm tall figureine, that came out pretty well. Still some blobbing. Settings pretty much identical to below but retraction was set to 7mm @ 55mm/sec
[img]http://farm9.staticflickr.com/8088/8373979372_affca5f4e0.jpg[/img]

I then ended the night by dialing up retraction to more like your settings 10mm retraction, 68mm/sec and went to bed with a 161mm tall version of the same model printing. The filament never kinked, but here is what I found in the morning-I think it is a metaphor for my psyche!:
[img]http://farm9.staticflickr.com/8507/8373978218_b17b330941.jpg[/img]

The next night I resolved to try the bigger print again- 161mm tall. Here's the print and the settings used. The print is really nice in comparison to my Printrbot, but I still get some blobbing and threads in the gaps between the legs...

[img]http://farm9.staticflickr.com/8506/8373270995_b105552cba.jpg[/img]
[img]http://farm9.staticflickr.com/8516/8374344952_4d63fb4f57.jpg[/img]
[img]http://farm9.staticflickr.com/8468/8373271935_301759b8d3.jpg[/img]
Settings:
[img]http://farm9.staticflickr.com/8233/8374366646_f6daec48a9.jpg[/img]
[img]http://farm9.staticflickr.com/8233/8373293537_9e4aef352e.jpg[/img]
[img]http://farm9.staticflickr.com/8213/8374366602_6bf2a6f880.jpg[/img]
[img]http://farm9.staticflickr.com/8075/8373293531_806b12fcdb.jpg[/img]
[img]http://farm9.staticflickr.com/8330/8374366562_0b850a606b.jpg[/img]
[img]http://farm9.staticflickr.com/8491/8373293491_42cdb006e2.jpg[/img]
[img]http://farm9.staticflickr.com/8376/8373293475_3a50489e41.jpg[/img]
[img]http://farm9.staticflickr.com/8473/8373293467_c5fafc20df.jpg[/img]
[img]http://farm9.staticflickr.com/8465/8373293463_ae8c176aea.jpg[/img]

Any advice on reducing the blobbing/stringing? Next up I am playing with setting retraction back up to 10mm at 68mm/sec and tweaking the tension on the extruder rollers- I get a very tiny bit of plastic dust on the rollers, but not bad at all.

[slausonm]

I read through the posts and did not see the answer to the original very first post. I am going through the calibration for the hot end on my Rostockand got a similar error message at the end of the process. I am trying it again as I type this.


Edit... Just finished. Same error message again. AFAIK the thermistor is seated properly in the hot end. I used automotive grade Silicon RTV to create the thermister assembly. I didn't have the silicon gasket material so I bedded it in normal high temp gasket material. The hot end seems to be comming up to temperature as it is going through the process, and I am getting a message in the box below the log that gives me a temperature, although it is now back to room temp and it reads 200.
Whats's up?

Thanks, Matt

[barnett]

If you're talking about the "Error:Line Number is not Last Line Number" message at the end of an autotune run, I thought someone said a newer marlin firmware version would fix this. But I haven't tried it and I still get this error. Doesn't seem to cause a problem though.

[slausonm]

Thanks, Just looking for confirmation that I'm not messing something up. We downloaded the newest software...I think. I will try the settings I obtained and carry on until the next problem/ question.

[jesse]

What's supposed to keep the bowden tube from popping off when the filament enters it from the extruder?

The tube just gets pushed upwards.

[Polygonhell]

What's supposed to keep the bowden tube from popping off when the filament enters it from the extruder?

The tube just gets pushed upwards.

The quick connect fitting should hold the tube so it can't move.

[JakeCShake]

What's supposed to keep the bowden tube from popping off when the filament enters it from the extruder?

The tube just gets pushed upwards.

Check out this thread for visuals....we had issues with this as well....

http://forum.seemecnc.com/viewtopic.php?f=42&t=978

[jesse]

Thanks for responding.

Here's a photo of the problem.

[img]http://i.imgur.com/jMISNtS.jpg[/img]

[fredini]

You need to push the Bowden tube further into that fitting. Once properly seated, there's little teeth in there that grab the tube and prevent it from pulling out.

[jesse]

Thanks, that fixed the problem.