Mini bearing pocket ID's

A forum dedicated to the stock LulzBot Mini 3D Printer
jim2386
Posts: 328
Joined: Sat Mar 07, 2015 1:46 pm

Mini bearing pocket ID's

Post by jim2386 » Thu Mar 19, 2015 8:21 am

Hey guys,

Just got my MINI yesterday and I'm having a blast with it. I'd just like to confirm my results with what I should expect.

I'm going to be using the mini to create a lot of cases for arduino based stuff. Those boards use M3 screws to hold the board to the case. The engineers handbook recommends that for an M3 screw, the thru hole should be 2.5mm before tapping. To test accuracy, I had the mini make a boss with a 2.5mm ID. Once printed, I used gauge pins to measure the results. The ID/hole diameter of the part came in at 1.4mm.

Thinking it might just be small dimensions that are difficult, I printed another bearing I had which has an ID of 4.1mm. When I measured it with a gauge pin, the resulting part came in at 3.24mm. Working with SLA machines, I know that holes will come in a bit tight, but I wanted to see if I should expect more/less out of the machine for these types of details.

As for the run mode I'm using HIPS, Cura quickprint, FINE detail. See the results below:
ScreenHunter_462 Mar. 19 10.16.jpg
Should my ID's be closer to my solid dimensions or am I getting expected results for this machine? Should I be using the HIPS profiles you guys provide for expert mode? Should I be buying a smaller nozzle diameter?

Thanks guys!
-Jim
Last edited by jim2386 on Thu Mar 19, 2015 8:53 am, edited 1 time in total.

jim2386
Posts: 328
Joined: Sat Mar 07, 2015 1:46 pm

Re: Mini bearing pocket ID's

Post by jim2386 » Thu Mar 19, 2015 8:44 am

One other sample part:
ScreenHunter_463 Mar. 19 10.42.jpg
Solid on the computer says the distance should be 7.88mm. Printed part came in at 7.43mm.

Same settings as I listed above.

Is my machine operating as expected? :)

-Jim

DawgBone
Posts: 73
Joined: Wed Mar 11, 2015 8:00 pm

Re: Mini bearing pocket ID's

Post by DawgBone » Thu Mar 19, 2015 8:18 pm

Not sure if I missed it or not... But what modeling software are you using?
Not Sketchup 2015?

IF so.... STOP!!! OR learn to measure twice after every step....<-- took allot of troubleshooting for me...

If not.... I've noticed that within my small time with the Mini, it doesn't do curved prints too well...
In that regard, circles are far from perfect and nothing I've done seems to fix it... Let it be said that I'm a bit of a newb...

With that... I would say that regardless of adjustment, that this guy in it's stock form isn't going to make precise models...

But my findings are that... While it does make some VERY awesome/fast prints; when we're talking MM's, it'll be up to you to adjust after the print...

I think the next step is to find a different nozzle, slicer... Everything else is there though...especially out of the box :D
Last edited by DawgBone on Thu Mar 19, 2015 8:45 pm, edited 1 time in total.

DawgBone
Posts: 73
Joined: Wed Mar 11, 2015 8:00 pm

Re: Mini bearing pocket ID's

Post by DawgBone » Thu Mar 19, 2015 8:23 pm

Also, I'm not 100% sure,, but I think the "expert" profiles are just the same as the quick settings....
I tried printing with both, and couldn't see anything different while watching through the entire prints...

From my searches, allot have asked about that, and I've yet to see a solid answer from the "crew"....

jim2386
Posts: 328
Joined: Sat Mar 07, 2015 1:46 pm

Re: Mini bearing pocket ID's

Post by jim2386 » Thu Mar 19, 2015 8:41 pm

Modeling Software: Siemens NX
Slicer: Cura

I saw lulzbot sells different nozzles. Are they easy to swap? Do I need more parts than just the nozzle? Is there a tutorial on how difficult it is to swap?

I'm assuming going to a smaller nozzle will increase the accuracy but decrease print speed?

Thanks
Jim

DawgBone
Posts: 73
Joined: Wed Mar 11, 2015 8:00 pm

Re: Mini bearing pocket ID's

Post by DawgBone » Thu Mar 19, 2015 9:33 pm

I'm not knowledgeable enough to give advice....

But a good test would be to render a small ring.... and test it...
I've beat on this machine, and it's "OK" from my experience... But it does drift a bit in my experiences... Like I said, making good circles seems to be hard to do...

I will find out how E-Sun filament works out, as it's the only filament that they fully support, and I was lucky enough to find some in stock...

Otherwise, these are printed from the same STL on two different machines(Zortrax/LB Mini)... Default/similar profiles... Black is Zortrax and white is LB...
Funny, that the internal hex ID size was right on between both machines, but the OD and thickness was off...
Attachments
20150319_222440.jpg
20150319_222453.jpg

Rickta59
Posts: 19
Joined: Thu Feb 05, 2015 7:13 pm

Re: Mini bearing pocket ID's

Post by Rickta59 » Fri Mar 20, 2015 8:50 am


stopshinal
Posts: 4
Joined: Thu Feb 05, 2015 10:39 am

Re: Mini bearing pocket ID's

Post by stopshinal » Fri Mar 20, 2015 1:14 pm

One of the first things you should check is your filament diameter. In the default Cura profile this is typically set at 2.85mm. On our mini we were having tolerance issues -- but these were quickly resolved by adjusting the filament diameter (for us, we're up around 3.07 mm with Lulzbot PLA eSun).

You'll have trouble making this configuration via the quickprint settings. So, you'll need to switch over to expert (please correct me someone if I am wrong) and load the desired PLA profile manually. Then - make the correction in the expert settings.

jebba
Site Admin
Posts: 689
Joined: Mon Mar 25, 2013 4:11 pm

Re: Mini bearing pocket ID's

Post by jebba » Fri Mar 20, 2015 10:08 pm

DawgBone wrote:Also, I'm not 100% sure,, but I think the "expert" profiles are just the same as the quick settings....
I tried printing with both, and couldn't see anything different while watching through the entire prints...
Ya, the quick settings and the expert settings are identical. If you switch to expert mode, you have to load an .ini, as it won't transfer over the config automagickally (but will in future rev).

DawgBone
Posts: 73
Joined: Wed Mar 11, 2015 8:00 pm

Re: Mini bearing pocket ID's

Post by DawgBone » Fri Mar 20, 2015 10:15 pm

I hate to wreck jim2386's post....
But thank's a butt-ton for the info... I learn more and more each day...

I bought a couple of 3MM IC3D's spools, only because it was associated well with LulzBot at Amazon...
Not only have I noticed allot of popping(air) in their filament, but it takes allot of cleaning to rid of the dye in their filament....<-- not to say that it's cause bad prints.... But it does have me wondering about filament...

Seems like every grandmother and their poodles are making filaments now-a-days...

I've just played with Gizmo Dorks' stuff, and so far so good... Even their "glow-in-the-dark" HIPS stuff, and yet it prints pretty dang good...<-- and actually truly glows for the most part... But I don't get the hissing/pissing/popping/and smudge like I've had from the IC3D stuff... They also advertise a 3MM filament, but the sticker says 2.85MM....
But like I said, so far Dorks' HIPS and ABS prints very well for me...

I've tried to order stuff recommended from Lulz, But it's hard to find in stock...
I got lucky and found a small roll of E-Sun, but have yet to print with it....

Post Reply