3DLC0002S Sliced Delta Pulley

[Karl]

Thanks to Paul and Douglas, I think the sliced delta pulley is ready for broader use. Ray, feel free to print it for Bruce after 3DLC0456.

https://github.com/firepick1/FPD-LooseCanon/wiki/3DLC0002S

[Karl]

Oh. And M8'ers can use it too, so don't despair...

[Bryan Smith]

I love this design, the built in gear is brilliant!

Some quick notes on my experience with it.  The following applies when using anything larger than 0.35mm nozzle diameter in Slic3r. 0.4 only slight shaves the gear teeth down.

I've being working on a solution to get this printed with my 0.5 mm nozzle. Unfortunately, I didn't look at the resulting gcode too closely before I printed them.  The gear doesn't grip the belt.  Slic3r GCode makes the teeth on the gear too small; practically non existent, Cura does good but has no Acceleration support I can see and makes my motors skip steps at any reasonable speed. To be honest I'm not thrilled about exploring new slicing software at this point or I may end up breaking something on accident or on purpose.  I'm gonna chalk the ratchet gear up for next build and hack something usable out of what I already printed because I need to get this build done 30 days ago :D

 

This is a pic of the 10mm ratchet gear at 0.5mm nozzle diameter.  

Gcode output 3d view on top, stl on bottom

Top Left is Cura, Top Right is Slic3r.

Bottom Left is STL cross section, Bottom right is STL whole gear

[TTN]

Cura will use the default acceleration settings in your firmware, so maybe try adjusting them in the firmware.

[Karl]

Bryan, I print mine with the standard TAZ 0.35mm nozzle, and it is definitely really cool to just pop the printed pulley off the bed and slip in a GT2 belt that ratchets into proper tension.

I would be very grateful if you could discover some way to render the gear properly with a 0.5mm nozzle. However, if that should prove infeasible, I can send you a set of TAZ-printed pulleys. Alternatively, you can wait for Neil's cable-tie adaptation that's non-reversible, but equally effective as a ratchet.

:D

[Karl]

Bryan, I hope you don't mind, but I added your picture to the wiki:

https://github.com/firepick1/FPD-LooseCanon/wiki/3DLC0002S

[Neil Jansen]

Here's my cable tie variant (see attached).  It's designed to be printed with a 0.5mm nozzle.  I'm happy with it, but it's not released yet.

--
You received this message because you are subscribed to the Google Groups "FirePick" group.
To unsubscribe from this group and stop receiving emails from it, send an email to firepick+u...@googlegroups.com.
To post to this group, send email to fire...@googlegroups.com.
Visit this group at http://groups.google.com/group/firepick.
For more options, visit https://groups.google.com/d/optout.

[Bryan Smith]

I'm not sure if it's a bug in Slic3r or not. I composed an issue on the Slic3r github and Lord2Vader responded with this:

"Well repetierhost shows the line where the nozzle is at. But at an 0,5mm nozzle the nozzle has to go in for 0.25mm ;) Seems right to me!
If your printing a radius 50mm your nozzle does a radius of 49,75mm.
Try Outer perimeters 0.1mm and it should not be that great in difference, just like choosing a smaller nozzle"

Unless I am misunderstanding, this still doesn't explain the reason for cutting the teeth off, it just reveals a workaround.

This setting is available in the compiled 1.2.7 experimental version at slic3r.org under Print Settings Tab->advanced ->External Perimeters.  I set External Perimeters to 0.35mm and the output on a test gear was much better.  Setting it to 0.1mm produced poor adhesion and extrusion on external perimeters.  As far as I understand it, this setting adjusts the extrusion multiplier on external perimeters to make tighter lines by compensating on how much is extruded, essentially "faking" a smaller diameter nozzle.

After printing with these settings, I can see the teeth in there ripe and plump for belt grabbing.  Unfortunately I can't get the gear to separate from the walls.  The perimeter of the gear is fusing with the perimeter of the outside wall and I can't make it stop aaahhhhgggg!  I fear this pulley is beyond my printers capabilities and I can't do anything to remedy the situation.

@TTN, Thanks for the Cura info, I adjusted my firmware and am going to try one more print to see if I can get successful results with Cura.  RepetierHost seems a better alternative to Pronterface anyway, especially for Delta bots.  

If it doesn't work out I think that I can drill out the gear and design and print a new one that can slide in, maybe even with 50% of the teeth, god knows I have tons of pulleys I can rework.  I really don't think the resolution of belt tightening or ability to grip requires every belt tooth to be secured by a gear tooth.  Why not just cut out half the teeth and change the geometry within to accommodate less detail requirements?  I'll give it a shot.

On a side note, I'm an Autodesk Inventor guy and unfortunately I think Cubify has done away with the free trial, I can't find it.  I had it at one time but I reformatted.  Does anyone have the trial download handy that they can get it to me?  Tracing STL files is a decent way to approximate a copy buy I'd really like to get to the sketches to make a decent copy of the files to an Inventor assembly.

On Sunday, February 1, 2015 at 5:46:03 AM UTC-8, Karl wrote:

[Michael Anton]

On Sunday, February 1, 2015 at 10:48:42 PM UTC-7, Bryan Smith wrote:

On a side note, I'm an Autodesk Inventor guy and unfortunately I think Cubify has done away with the free trial, I can't find it.  I had it at one time but I reformatted.  Does anyone have the trial download handy that they can get it to me?  Tracing STL files is a decent way to approximate a copy buy I'd really like to get to the sketches to make a decent copy of the files to an Inventor assembly.

The Cubify Design trial can be found here: http://cubify.com/en/Products/Design.

Mike

[Karl]

Bryan, thanks for the heroic efforts at the perimeter of printability. The TAZ gears also initially stick to the pulley. I just insert a 5mm driver and twist firmly to snap the gear free. However, if that fails, then I extend my condolences and apologies for having designed a tough-to-print piece. Neil's pulley will be quite printable, but has no embedded gear.

[Bryan Smith]

Thanks Mike I missed that one. Actually, I just realized that opening in my vertical monitor displays a slimmed down version of the site without the trial links.

@Karl

The first set of pulleys I printed snapped apart nicely.  I think the overshoot is just too much for my machine when playing with the External Perimiter width settings in Slic3r. It feels more like a poor workaround. 

It doesn't matter anymore anyway because the gear snaps apart fine when printed with Cura, which by the way produced perfectly usable pulleys with working gears!!

[Karl]

Bryan, thanks for doing the Cura research. If you would like me to post any information (GCode, instructions, etc.) to the wiki, let me know. Glad your pulleys are ratcheting!

 :D

[Bryan Smith]

I'm more than happy to share anything.  If I can contribute something useful then even better.  It makes it feel less like "wasted days" and more like research ;) 

To get this to work in Slic3r, uncheck "Detect thin walls".  I thought I had tried that before.  Guess not.  I hope it's ok I updated the wiki :)

Here's the convo:

https://github.com/alexrj/Slic3r/issues/2611

[Ray Kholodovsky]

Bryan - contact me off list and I'll send you the link to download STL importer Inventor (called Mesh Enabler).  You'll be able to use the measure tool then.  Obviously circles will still be tessellations and whatnot but there are workarounds for all that.

[Karl]

Bryan, Oh Wow!  I am glad I had set the wiki to allow any Github user to update it. Thanks for the research and resolution. :D  

[Gaurav Singh]

Hello,
What is the length of gt2 belt for connecting motor and 3D printed pulley?

[Douglas Pearless]

It's rather difficult to measure mine on my FirePick, but I think if you allowed 300mm then you could cut the extra off the end.

Cheers
Douglas

Sent from my iPhone

> On 7/12/2016, at 4:35 PM, Gaurav Singh <gaura...@gmail.com> wrote:
>
> Hello,
> What is the length of gt2 belt for connecting motor and 3D printed pulley?
>

> --
> You received this message because you are subscribed to the Google Groups "FirePick" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to firepick+u...@googlegroups.com.
> To post to this group, send email to fire...@googlegroups.com.

> Visit this group at https://groups.google.com/group/firepick.

[Gaurav Singh]

Hi Karl,

            Can you please tell me how exactly is that gt2 belt attached to pulley?

[Michael Anton]

I put a belt around one of my existing belts and came up with 400mm.  That is probably a bit generous, since I left a bit extra at the ends, and I went around an existing belt, but it should be pretty close to what you would want to have.  Get a 2m length, and you will have lots of extra in case you have problems.

Mike

[Michael Anton]

Oops, sorry I answered the previous question the first time.

You might find this guide helpful, if you don't already know about it: http://firepickdelta.dozuki.com/c/Beta_Kit_Hardware.  It contains the answer to your question.

Mike

On Tuesday, December 6, 2016 at 11:55:05 PM UTC-7, Gaurav Singh wrote:

[Karl]

Gaurav, buy a little extra. Something always goes wrong and you'll end up needing the extra. For example, there are two sliced pulleys. The LooseCanon sliced pulley may be unprintable on some 3DPrinters because it has an internal 3DP gear. The Tin Whiskers sliced pulley uses a different belt mechanism and the belt lengths are different.

Also, if you end up adding a FirePaste gantry onto your FPD, you'll need even more GT2 belt for THAT. :D

By the way, welcome to the FPD wild west cowboys. We make things up as we go along. :o