Broke my hot end tonight...

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Chris Muncy
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Broke my hot end tonight...

Postby Chris Muncy » Mon Apr 02, 2012 10:44 pm

Well I was installing the "hose clamp" X axis tensioner this evening. No daughter or grand daughter around so it was pretty quiet. Got everything buttoned up, loaded a file, and let-r-rip. Well snap is more like it. The nozzle hit the print bed going to 0,0,0 then as it moved to start the loop I drug the tip across the kapton-on-glass and the next thing I know it's all fubar'd.

So Steve/John, I just placed an order for a new PEEK tube and a new acorn nozzle. If you could see to ship it tomorrow I might not have too bad withdraws.

*sigh*
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Re: Broke my hot end tonight...

Postby michaellatif » Mon Apr 02, 2012 10:57 pm

Ouch! I know that if I didn't have endstops I would have done the exact same thing and my neighbors would have found out that I swear like a sailor!

-Mike
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Re: Broke my hot end tonight...

Postby Chris Muncy » Mon Apr 02, 2012 11:14 pm

Post some pics of those so I can see how you did it.
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Re: Broke my hot end tonight...

Postby cquinby » Mon Apr 02, 2012 11:21 pm

Sorry to hear that Chris. Was this the famous load the g-code, move an axis and then his start??? I smashed more endmills and drill bits on my mill till I stuck a huge note on the grease board says "REGEN TOOLPATH!!!!!!!"

Once I figured that one out never had a issue since...

Now if I can get this dang solid infills to fill my parts. Off to make a post on that one.
__

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Re: Broke my hot end tonight...

Postby michaellatif » Mon Apr 02, 2012 11:57 pm

Chris Muncy wrote:Post some pics of those so I can see how you did it.


Here are some pics of the photo-interrupter endstops. They are old (~3 weeks old) but the endstops are in the same location and look the same.

H-1 - custom_photo_interup_endstop_x_axis(1).JPG

H-1 - custom_photo_interup_endstop_x_axis(2).JPG

H-1 - custom_photo_interup_endstop_y_axis(1).JPG

H-1 - custom_photo_interup_endstop_y_axis(2).JPG

H-1 - custom_photo_interup_endstop_z_axis(1).JPG

H-1 - custom_photo_interup_endstop_merg_point(1).JPG
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Re: Broke my hot end tonight...

Postby Chris Muncy » Tue Apr 03, 2012 8:24 am

cquinby wrote:Sorry to hear that Chris. Was this the famous load the g-code, move an axis and then his start??? I smashed more endmills and drill bits on my mill till I stuck a huge note on the grease board says "REGEN TOOLPATH!!!!!!!"

Once I figured that one out never had a issue since...

Now if I can get this dang solid infills to fill my parts. Off to make a post on that one.


No I must have moved in Z just slightly when the steppers were off while I was doing the belt tension mod. It didn't slam in to the glass (been there, done that, really pissed me off) like when I started using Slic3r.
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Re: Broke my hot end tonight...

Postby Leeway » Fri Apr 06, 2012 5:57 pm

There is a place in Slic3r where you can add code for it to do. I am thinking about adding some to raise the Z a bit before the move to the center of the bed for just this reason.
Mine is a Prusa, but not immune to this very thing. Where it homes, there is no bed under it. Nice to be able to purge the nozzle, but if you forgot to readjust the bed or it is just a bit low for some reason, wham. If the Z lifts instead and then goes to center and then down again, there is no real crash. My bed is on springs, so easier on the hotend.
You might consider that as well.
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Re: Broke my hot end tonight...

Postby mhackney » Fri Apr 06, 2012 6:42 pm

Lee, your bed is on springs? Can you tell me about that? Is this a standard way to mount a hot bed on a Prusa?

regards,
Michael

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Re: Broke my hot end tonight...

Postby Leeway » Fri Apr 06, 2012 7:01 pm

yes it is. It comes in the Prusa build kit, not the heated bed kit. The bed itself is on springs and then the heated bed bolts to the top of that and then your glass clamps on. I just clamp my glass to the heat bed circuit board lightly around the edges with Gem clips.

Having the springs there can be frustrating to start with, but once you print out some quick adjust knobs, they work great.
Hoss's thread on CNC zone shows them pretty well.
Lee

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Re: Broke my hot end tonight...

Postby michaellatif » Fri Apr 06, 2012 10:25 pm

For my H-1 I have the standard/basic bed (the one that comes with the kit) attached to the carriages and then a heat bed (custom built) is held in place with bolts and springs to make leveling/adjusting a breeze.

IMG_0305.JPG

IMG_0304.JPG

IMG_0303.JPG

IMG_0302.JPG

IMG_0301.JPG
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Re: Broke my hot end tonight...

Postby Eaglezsoar » Sat Apr 14, 2012 2:23 pm

[quote="michaellatif"]For my H-1 I have the standard/basic bed (the one that comes with the kit) attached to the carriages and then a heat bed (custom built) is held in place with bolts and springs to make leveling/adjusting a breeze.

Thanks for the great pictures! Your design with the springs on the bed inspired me to attempt something similar.

Regards,

Carl
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Chris Muncy
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Re: Broke my hot end tonight...

Postby Chris Muncy » Sun Apr 15, 2012 10:22 am

So I *had* 2 days home between trips and still haven't had a chance to touch my printer. I'm hoping for this afternoon when the storm comes in and its just me and the Mrs. in the house.

My current problem is getting the rest of the melted PEEK out of the aluminum part of the hot end. Even with dental picks its a bear.

Anyone have any ideas? I also thought of running a tap through it but I bet its non standard.
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Re: Broke my hot end tonight...

Postby Leeway » Sun Apr 15, 2012 10:33 am

heat it up first with a torch.
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Re: Broke my hot end tonight...

Postby michaellatif » Sun Apr 15, 2012 11:14 am

Leeway wrote:heat it up first with a torch.

Yep, torch or heat gun set to burn :-)
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Re: Broke my hot end tonight...

Postby johnoly99 » Sun Apr 15, 2012 5:16 pm

3/8-24 is the thread size chris
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Re: Broke my hot end tonight...

Postby Chris Muncy » Sun Apr 15, 2012 5:39 pm

Thanks John,

But when my wife wasn't looking I grabbed it and held it over the gas stove for a few minutes and let it burn the PEEK out. I now am reassembling it and just got done with the RTV on the thermister. Hopefully when I get back in town Friday night I can get the rest of it back together.
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