<![CDATA[SoliForum - 3D Printing Community — Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> 2013-12-11T12:01:53Z PunBB https://www.soliforum.com/topic/4491/updated-pics-reprapdiscount-bulldog-allmetal-extruder-project/ <![CDATA[Re: Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> Sorry for the newb question but to install the XL on my sd3 with the print board is there anything else I have to do besides change the steps per min?

]]> https://www.soliforum.com/user/3726/ 2013-12-11T12:01:53Z https://www.soliforum.com/post/43959/#p43959 <![CDATA[Re: Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> I understand now smile thank you both for the explanation.

]]> https://www.soliforum.com/user/3979/ 2013-12-07T12:52:33Z https://www.soliforum.com/post/43538/#p43538 <![CDATA[Re: Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> I should have said that running the E3D at 310C makes the hotend into a self cleaning oven. If you have any filament in the hotend when you run it at that temp for an extended period of time, the filament turns into ash.

]]> https://www.soliforum.com/user/1906/ 2013-12-07T02:37:37Z https://www.soliforum.com/post/43509/#p43509 <![CDATA[Re: Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> reprapdiscount wrote:
2n2r5 wrote:

The bulldog has a fan built in that seems to cool the fins just fine. I have done several extended tests at 310C (turns the extruder into a self cleaning oven at that point)

If you are worried I added a fan mount for cooling the E3D Fins.

What you mean "self cleaning oven" smile sorry my english is really poor.

He means at that temp it will help carbonize any bits of plastic and combined with the stainless steel when you purge new filament through it effectively 'cleans' it. http://en.wikipedia.org/wiki/Self-cleaning_oven

Its not quite a self cleaning oven, since they often use much much higher temps - and if you do this in a well ventilated area to avoid the small amount of noxious gases released depending on the filament, it can prevent having to blow torch a nozzle to unblock it.

]]> https://www.soliforum.com/user/663/ 2013-12-07T02:36:02Z https://www.soliforum.com/post/43507/#p43507 <![CDATA[Re: Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> 2n2r5 wrote:

The bulldog has a fan built in that seems to cool the fins just fine. I have done several extended tests at 310C (turns the extruder into a self cleaning oven at that point)

If you are worried I added a fan mount for cooling the E3D Fins.

What you mean "self cleaning oven" smile sorry my english is really poor.

]]> https://www.soliforum.com/user/3979/ 2013-12-07T02:26:35Z https://www.soliforum.com/post/43505/#p43505 <![CDATA[Re: Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> The bulldog has a fan built in that seems to cool the fins just fine. I have done several extended tests at 310C (turns the extruder into a self cleaning oven at that point)

If you are worried I added a fan mount for cooling the E3D Fins.

]]> https://www.soliforum.com/user/1906/ 2013-12-06T15:58:09Z https://www.soliforum.com/post/43427/#p43427 <![CDATA[Re: Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> I print nylon frequently. I suppose I can modify you fan design a bit just to be safe.

]]> https://www.soliforum.com/user/1682/ 2013-12-06T15:21:49Z https://www.soliforum.com/post/43421/#p43421 <![CDATA[Re: Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> Stevos758 wrote:

I like that coupler........ Do want......

It looks like I no longer will need to fun a fan on the E3D?

It seems that way. I think Sanjay said before that you should be okay without the fan unless you start printing PC or anything at higher temps. Don't quote me on that.

]]> https://www.soliforum.com/user/1906/ 2013-12-06T15:17:51Z https://www.soliforum.com/post/43420/#p43420 <![CDATA[Re: Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> I like that coupler........ Do want......

It looks like I no longer will need to fun a fan on the E3D?

]]> https://www.soliforum.com/user/1682/ 2013-12-06T14:47:54Z https://www.soliforum.com/post/43413/#p43413 <![CDATA[Re: Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> techbuilder2175 wrote:

That coupler only will only work with the threadless ball screw as the variations in the rod will cause it to bind.

I look forward to seeing the difference the 1/32 micro stepping makes

That coupler is on there tighter than I have been able to get them with screws and better centered. The coupler uses thermal expansion (375 in an oven for 2 hours) to fit on the 8mm rod then as it cools it shrinks to the original size (which is under 8mm) and holds on very tight. I wasn't able to get it off of my test rod using channel locks and a vise. (without damaging the rod)

But yes, I would assume that this wouldn't work on a threaded rod.

]]> https://www.soliforum.com/user/1906/ 2013-11-27T00:03:40Z https://www.soliforum.com/post/42653/#p42653 <![CDATA[Re: Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> That coupler only will only work with the threadless ball screw as the variations in the rod will cause it to bind.

I look forward to seeing the difference the 1/32 micro stepping makes

]]> https://www.soliforum.com/user/2779/ 2013-11-26T23:53:33Z https://www.soliforum.com/post/42652/#p42652 <![CDATA[Re: Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> Here is a test print. I had to hold the vase up to the light so that you could see any moire. This is without the DRV8825. I will be putting it back on tonight probably. Good results and I am just at 500 steps/mm.  I also attached a picture of my new coupler. Someone made it for me and I am not sure whether they want to be named. If someone is interested, I can probably put you in contact with him. I like the coupler because it doesn't use screws on the 8mm side and has zero backlash since it is a solid design. 

http://2n2r5.com/pictures/printer/show-n-tell/bulldog_fixed_coupler1.JPG
http://2n2r5.com/pictures/printer/show-n-tell/bulldog_fixed_coupler2.JPG
http://2n2r5.com/pictures/printer/show-n-tell/bulldog_fan.JPG
http://2n2r5.com/pictures/printer/show-n-tell/bulldog_fixed_coupler4.JPG

]]> https://www.soliforum.com/user/1906/ 2013-11-26T23:39:27Z https://www.soliforum.com/post/42650/#p42650 <![CDATA[Re: Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> Hey 2n2r5,

Have you had the chance to mount it and has it removed more moire then the 0.9 degree stepper with the DRV8825?

]]> https://www.soliforum.com/user/2779/ 2013-11-26T23:11:21Z https://www.soliforum.com/post/42647/#p42647 <![CDATA[Re: Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> Here is the extruder fan mount that I am using and the Sketchup file for everything.

]]> https://www.soliforum.com/user/1906/ 2013-11-26T22:58:32Z https://www.soliforum.com/post/42645/#p42645 <![CDATA[Re: Updated Pics! - RepRapDiscount "Bulldog" Allmetal Extruder Project]]> Here are all of the mounting options so far for the Bulldog. These have only been tested with the E3D and may require addition modification to work with other (shorter) hotends.

For replacing the top panel of Lawys's carriage for use with belts print  - bulldog_lawsy_carriage_top_replacement_belts.stl

For replacing the top panel of Lawys's carriage for use with fishing line or cables print - bulldog_lawsy_carriage_top_replacement_cable.stl

For Adapting to Lawys's carriage top instead of replacing it print - bulldog_Lawsy_carriage_topper.stl

For Adapting to the OEM SD carriage print - bulldog_SD_carriage_topper.stl

]]> https://www.soliforum.com/user/1906/ 2013-11-26T22:57:14Z https://www.soliforum.com/post/42644/#p42644