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 > 3d printers for making stuff for the RV

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2112

Texas

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Posted: 04/05/22 03:50am Link  |  Quote  |  Print  |  Notify Moderator

I printed a 20X20 test cube this morning using ABS to closely observe the odor and to see how well it would bond to a cold, untreated glass build plate.

It started corner lifting at 4mm on the first attempt and 9mm on the second. Failed

Then I gave it a glue stick wipe and all went well.

[image]

However, I did notice after about 1.5 hrs of operation the bed temp went from 25C to 37C just from nozzle heat exposure so that puts the validity in question

My primary objective was to observe odor. I generally don't pay attention to it. With the enclosure closed I couldn't smell anything, even standing above it. When I open the enclosure to get my hands in it I certainly notice the chemical smell but it's not overwhelming. It does have a burning plastic smell. I even went outside for 5 minutes to clear my senses and came in and walked straight to the printer and couldn't smell it until I opened the enclosure.

BTW, my enclosure is 3 $10 Walmart end tables stacked and $40 of Home Depot plexiglass. I printed all the mounting brackets and knobs in ABS (under the cardboard box) [emoticon]


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2112

Texas

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Posted: 04/05/22 06:07am Link  |  Quote  |  Print  |  Notify Moderator

While I'm talking about the enclosure, here's a hardware design tip someone might find useful.
I embedded 6-32 nuts in knobs by creating a clearance hex slot in the knob and press the nuts into place. I use these as retainer nuts to secure the plexiglass as well as handles on the plexiglass to make it easy to remove and handle.

[image]

I shouldn't of recessed the plexiglass panels as I did. I gave up internal real estate doing this.

StirCrazy

Kamloops, BC, Canada

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Posted: 04/05/22 06:46am Link  |  Quote  |  Print  |  Notify Moderator

2112 wrote:


Most anything small other than nylon will hold on cold, clean glass.


ya people keep saying that [emoticon] I see a huge problem with glass going around but it seams to be with the newer ender beds. mine worked great for about 10 to 15 prints then all of a sudden when I switched to PETG nothing would stick, thought it was the switch but found PLA wouldnt stick either. been some questions going around weather it is some special coating or type of glass that when the coating gets dammaged it doesnt work??? glue stick didnt work for me, maybe i used the wrong kind, hair spray worked pretty good but I am excited to try my PEI sheets. been installing hardwood floors all my days off so the printers are neglected.


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LittleBill

Scranton, PA USA

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Posted: 04/05/22 07:09am Link  |  Quote  |  Print  |  Notify Moderator

its interesting you don't use any bed heating for abs, seems to go against popular belief.

Although you may not smell it, apparently ABS is the worst in terms of voc and particle emissions. Not sure if you watched the video at all.

my print is done, I will post photo's in a bit, overall it was a success, but I learned a couple things on a print this big, with a layer height much larger.





2112

Texas

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Posted: 04/05/22 09:36am Link  |  Quote  |  Print  |  Notify Moderator

LittleBill wrote:

its interesting you don't use any bed heating for abs, seems to go against popular belief.
Not if it's a small print with little mass. It takes longer to heat it up than it does to print. I'm sure the enclosure helps.

That 20X20 is about as far as I would go cold, that's why I drew it that size. That was my comfortable limit this morning.

When I started I thought everything had to be hot, done by the numbers, don't deviate from internet folklore. I have another spool of ABS I haven't tried yet. I may have to work that material differently.

My intent was to demonstrate how well glue on glass works with a tuned in machine. I thought I could get by without the glue but it was too tall. A little twist and it popped right off. No hammer and chisel required.

Quote:

Although you may not smell it, apparently ABS is the worst in terms of voc and particle emissions. Not sure if you watched the video at all.
You're exposed to more VOC walking into a furniture store or anywhere around town. Stay out of parking garages.

Quote:

my print is done, .... I learned a couple things ....
and that's what it's all about. It got you off the couch, didn't it?

* This post was edited 04/05/22 09:49am by 2112 *

2112

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Posted: 04/05/22 10:11am Link  |  Quote  |  Print  |  Notify Moderator

StirCrazy wrote:

ya people keep saying that. I see a huge problem with glass going around but it seams to be with the newer ender beds
There is counterfeit borosilicate glass out there.

Quote:

mine worked great for about 10 to 15 prints then all of a sudden when I switched to PETG nothing would stick, thought it was the switch but found PLA wouldnt stick either
That's a classic trait of tempered glass

Quote:

glue stick didnt work for me, maybe i used the wrong kind
It has to be Elmer's Diappearing Purple School Glue. You can get it at any dollar store for, you guessed it, one dollar

[image]

LittleBill

Scranton, PA USA

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Posted: 04/05/22 10:30am Link  |  Quote  |  Print  |  Notify Moderator

some photo's, I like this as its much smaller then the one autoformer sells, although its still pretty large.

largest support structure I have ever printed, which still failed a bit for me( need to make some adjustments here)

[image]

[image]

[image]

[image]

2112

Texas

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Posted: 04/05/22 11:53am Link  |  Quote  |  Print  |  Notify Moderator

Dang weird looking support. What slicer do you use? I'm guessing Cura.

Nice job *thumbs up*

Could you have created a ledge with some weep channels to support the auto transformer and left the center open? I guess to ask it differently, is the grill necessary?

LittleBill

Scranton, PA USA

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Posted: 04/05/22 12:10pm Link  |  Quote  |  Print  |  Notify Moderator

2112 wrote:

Dang weird looking support. What slicer do you use? I'm guessing Cura.

Nice job *thumbs up*

Could you have created a ledge with some weep channels to support the auto transformer and left the center open? I guess to ask it differently, is the grill necessary?


that is upside down tree supports. I will provide a better photo.

the autoformer weighs 21 pounds. i think the edges are only 6mm thick. that said that grid is a drain pad for water, and drains to a canal then exits via the holes on the side.

after placing the unit on the stand, 99% of the grid is covered, not sure if it was necessary, but it was a edge plane, which was a new technique to learn, so I am happy with that.

Honestly i just ripped off hughes design, after thinking about your comment. i guess opening up the bottom would have been doable, and reduced the time and material. there are about 6 changes I would do, but this worked better then expected.

I do use Cura. "Combing" almost destroyed that grid. first time I have ever seen a design do that. I either need to turn combing off or go to z hop for this part. thats why the top looks so rough. it easily made 400 + combing passes.

LittleBill

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Posted: 04/05/22 12:17pm Link  |  Quote  |  Print  |  Notify Moderator

some different angles of the tree supports.

[image]

[image]

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