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Author Topic: So ... 3d Printers....  (Read 23827 times)

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PL1

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Re: So ... 3d Printers....
« Reply #720 on: April 15, 2018, 12:45:50 am »
So did you screw right into the holes or did you have to tap them first?  I'm only asking because I've had mixed success in regards to screwing into pla without it splitting.... seems to depend upon the model greatly.
No need to drill/tap this model because the screw hole sizes are exactly the right size . . . at least for my printer and slicer settings.   ;)

- The machine screw holes (outer columns) just barely brush against the threads.

- The PCB screw holes (inner columns, top) even survived a test using a #6 sheet metal screw instead of a #4 -- the hole stretched, but did not crack.

- The PCB bottom screw hole (center through-hole, bottom) is slightly larger than the PCB screw holes to prevent the cracking that PBJ noticed in one of the v0.02 prints.

If you print the part and have problems with cracking:
- Change the related screw hole size variable(s) in lines 37-39 of the SCAD file
- Preview
- Render
- Output a custom STL

The consideration that some part designers overlook is that instead of removing a circular hole (green), the software removes an inscribed polygon.(blue)



The number of sides of that blue polygon is controlled by the variable "$fn=" -- the number of fragments used to render a full circle. (Line 41 of the SCAD file)

To produce a hole like the blue hexagon in the picture above, use "$fn=6".

For an octagon, use "$fn=8".

For a 180-sided polygon, use "$fn=180" -- I know it's overkill, but this is a small part so the render time is still reasonable.


Scott
« Last Edit: April 15, 2018, 12:52:21 am by PL1 »

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Re: So ... 3d Printers....
« Reply #721 on: April 15, 2018, 01:19:29 am »
Yeah I've ran into the polygon issue already with my 3d printing adventures.  I made a sort of hub to hold  a detachable star wars yoke for my racing rig and upon the first print I was disappointed to find I had wasted two hours printing a blocky mess that the neck of the yoke wouldn't plug into... cranked the poly count for the cylinder up to 180 and it was fine. 

HaRuMaN

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Re: So ... 3d Printers....
« Reply #722 on: April 15, 2018, 01:27:27 am »
Nice!

Locke141

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Re: So ... 3d Printers....
« Reply #723 on: April 15, 2018, 07:56:22 am »
I love this thread.

Just got a 3D printer at work, a mono price select V1. Its not for personal use but as Im going to be buying the ABS & PLA and I need to train the technology teacher on how to use it, I dont see whay I cant get some test prints from here.

PL1

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Re: So ... 3d Printers....
« Reply #724 on: May 16, 2018, 10:51:20 pm »
Here's a weird one.   :dizzy:

PBJ asked me to print this Bally drop target from thingiverse.

I loaded the STL into Cura and turned it on it's side to reduce the odds of layer separation breaking the spring loop.  (supports and raft enabled)



When I tried to print it . . . fail.   :banghead:
(I stopped it at around 75% and removed the raft and supports)



The loop part of the model was "negated" (solid center, no loop  :dizzy:) and a slot ran down the middle and cut into the semi-circle under the target.

Re-loaded the model into Cura and normal view looks OK, but layer view shows the "negated" loop and slot down the middle in place of the center ridge.



Can anyone duplicate this?

Is this a problem with the model or is it caused by the old version (IIIP-i3?) of Cura that came with my Monoprice Maker Select V2 printer? (Wanhao Duplicator i3 clone)


Scott

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Re: So ... 3d Printers....
« Reply #725 on: May 17, 2018, 03:23:26 am »
I am at work now but when I get home I will load this up in Simplfy3d and see if I get the same results.

Titchgamer

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Re: So ... 3d Printers....
« Reply #726 on: May 17, 2018, 05:26:29 am »
Here's a weird one.   :dizzy:

PBJ asked me to print this Bally drop target from thingiverse.

I loaded the STL into Cura and turned it on it's side to reduce the odds of layer separation breaking the spring loop.  (supports and raft enabled)



When I tried to print it . . . fail.   :banghead:
(I stopped it at around 75% and removed the raft and supports)



The loop part of the model was "negated" (solid center, no loop  :dizzy:) and a slot ran down the middle and cut into the semi-circle under the target.

Re-loaded the model into Cura and normal view looks OK, but layer view shows the "negated" loop and slot down the middle in place of the center ridge.



Can anyone duplicate this?

Is this a problem with the model or is it caused by the old version (IIIP-i3?) of Cura that came with my Monoprice Maker Select V2 printer? (Wanhao Duplicator i3 clone)


Scott

Its probably the model, Ive had this issue before where it was caused by un sealed edges.

If you load it into a editor you may be able to repair it.

05SRT4

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Re: So ... 3d Printers....
« Reply #727 on: May 17, 2018, 11:33:45 am »
Yeah the model has the same issue and a few other discrepancies when I load it in Simplfy3d.

05SRT4

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Re: So ... 3d Printers....
« Reply #728 on: May 17, 2018, 01:00:02 pm »
Try this one, I just traced everything from the original in fusion360. It fixed all the weird issues I saw but the circle was still filled in. I change some settings to get the hole to show up. Enabled single outline extrusion.

pbj

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Re: So ... 3d Printers....
« Reply #729 on: May 17, 2018, 02:08:53 pm »
Can you add some support to either side of the center ring?  That area was reinforced on the original parts.


PL1

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Re: So ... 3d Printers....
« Reply #730 on: May 17, 2018, 02:11:04 pm »
Try this one, I just traced everything from the original in fusion360. It fixed all the weird issues I saw but the circle was still filled in. I change some settings to get the hole to show up. Enabled single outline extrusion.
Thanks.   ;D

Normal and layer views are both good -- looks like a winner!   :applaud:   :notworthy:   :applaud:


Scott

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Re: So ... 3d Printers....
« Reply #731 on: May 17, 2018, 04:48:52 pm »
Can you add some support to either side of the center ring?  That area was reinforced on the original parts.



Done, now that I got it shaped out I can add whatever so get your requests in now.

pbj

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Re: So ... 3d Printers....
« Reply #732 on: May 17, 2018, 05:00:23 pm »
Yes... yes... good.... goooooood.

 :cheers:

PL1

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Re: So ... 3d Printers....
« Reply #733 on: May 17, 2018, 05:28:22 pm »
Just finished testing the Version 1 print.

By printing the model on it's side, the spring loop is strong enough to suspend and gently bounce a 5 lb. dumbbell with no problem.   ;D

Version 2 looks even stronger.   :applaud:

I'll print one on it's back and another on it's side to see how they compare.


Scott

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Re: So ... 3d Printers....
« Reply #734 on: May 18, 2018, 01:08:05 am »
The Version 2 flat and side prints came out great.

The spring loop on both is strong enough to suspend and gently bounce a 5 lb. dumbbell with no problem.   ;D
-----------
I probably should have asked this earlier, but which pinball machine are you repairing?

There are several versions of the Bally drop target.

The model we've been working with is a flat-top (a.k.a. tombstone) version with no spacer nub at the bottom.

The picture you posted is the ramp-top (a.k.a. hood or ledge) version with a spacer nub at the bottom.

Fathom, Black Pyramid, and Spectrum are the three pins I've found that use the green drop targets you mentioned in a PM -- all three use the ramp-top version.   :dunno


Scott

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Re: So ... 3d Printers....
« Reply #735 on: May 18, 2018, 09:39:42 am »
Spectrum.   :timebomb:

Titchgamer

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Re: So ... 3d Printers....
« Reply #736 on: May 19, 2018, 09:18:42 am »
Well I finished my design for the TMC speed loader/winder and I have also altered it to fit my T15.

Also printed some extended mag releases for my TPXs.

Paintball prints seem to be the order of business atm lol

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Re: So ... 3d Printers....
« Reply #737 on: May 19, 2018, 12:14:45 pm »
Well I finished my design for the TMC speed loader/winder and I have also altered it to fit my T15.

Also printed some extended mag releases for my TPXs.

Paintball prints seem to be the order of business atm lol

You use tinkercad?

Titchgamer

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Re: So ... 3d Printers....
« Reply #738 on: May 19, 2018, 12:53:17 pm »
Well I finished my design for the TMC speed loader/winder and I have also altered it to fit my T15.

Also printed some extended mag releases for my TPXs.

Paintball prints seem to be the order of business atm lol

You use tinkercad?


Ashamed to say ive been using sketchup lol

HaRuMaN

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Re: So ... 3d Printers....
« Reply #739 on: May 19, 2018, 02:47:11 pm »
Well I finished my design for the TMC speed loader/winder and I have also altered it to fit my T15.

Also printed some extended mag releases for my TPXs.

Paintball prints seem to be the order of business atm lol

You use tinkercad?


Ashamed to say ive been using sketchup lol

I like sketchup wayyyyyy better than tinkercad

Titchgamer

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Re: So ... 3d Printers....
« Reply #740 on: May 19, 2018, 03:12:04 pm »
Well I finished my design for the TMC speed loader/winder and I have also altered it to fit my T15.

Also printed some extended mag releases for my TPXs.

Paintball prints seem to be the order of business atm lol

You use tinkercad?


Ashamed to say ive been using sketchup lol

I like sketchup wayyyyyy better than tinkercad

So do I but its nowhere near as versatile.

Vigo

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Re: So ... 3d Printers....
« Reply #741 on: May 19, 2018, 08:33:00 pm »
Freecad, yo. Freecad.  8)

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Re: So ... 3d Printers....
« Reply #742 on: May 19, 2018, 11:08:19 pm »
Fusion360 is getting easier for me.

  
 

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