Maximum span on a horizontal flat topped hollow 3D print?

[Fred Bartels]

Hi All,

I know that you can successfully print a hollow (0% fill) 3D object with a flat top as long as the top is perfectly horizontal and the span is not too long. I'm wondering if anyone has done testing to find out how long the span can be?

Thanks,

Fred

[Joshua Gold]

My 2nd print had about a 2 cm span that was maybe 3 mm high and 2 cm deep.  It definitely bowed in a tiny bit.  I have a Da Vinci 1.0.  However, I think there is a setting that will use some scaffolding that can be scraped out to make it more precise.

[Fred Bartels]

Thanks Joshua,

I've done 17 mm without any significant bowing. I'll run some tests and report back what a Makerbot 2 can do. Since the shapes being printed will be enclosed, and parts of a light sculpture, I don't want to use any scaffolding.

--
For a compilation of resources/links/etc mentioned on this forum, visit: https://sites.google.com/site/k12makers/
---
You received this message because you are subscribed to the Google Groups "K-12 Fab Labs and Makerspaces" group.
To unsubscribe from this group and stop receiving emails from it, send an email to k-12-fablabs...@googlegroups.com.
To post to this group, send email to k-12-f...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/k-12-fablabs/effdc5ea-4e14-4ead-a243-5ec5232fe85d%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

--

Fred Bartels
An Independent School Educator

[Design Make Teach]

There are some very radical examples of bridging that have been done. They generally require good cooling and well tuned print speeds & extruder temps. Carefully examine the gcode visualizations to ensure that your slicer is starting and stopping the bridging threads on islands and not trying to attach to another thread in mid air.

The Make: 2015 3D Printer Shoot Out Test Models includes a bridging test geometry http://www.thingiverse.com/thing:533472

There are multiple Makes of the test geometries with photos so that you can gauge the success of a variety of printers and compare to your own prints. You can use the bridging test geometry to tweak your setup.

Have a great day.

-Josh

On Friday, January 30, 2015 at 10:29:01 AM UTC-5, fredbartels wrote:

[Fred Bartels]

Thanks Josh,

When I took design classes up at Yestermorrow one of the teachers was a semi-retired Canadian engineer with a dry sense of humor named Ed. He was always pointing out the importance of context and how designers often neglect context. In one crit session a student was asked how rain would impact a particular feature of his design. The student replied that he hadn't considered rain. Without missing a beat Ed called out "Now you're thinking like an architect!" 

Thanks for reminding me of the importance of context.

Fred

--

For a compilation of resources/links/etc mentioned on this forum, visit: https://sites.google.com/site/k12makers/
---
You received this message because you are subscribed to the Google Groups "K-12 Fab Labs and Makerspaces" group.
To unsubscribe from this group and stop receiving emails from it, send an email to k-12-fablabs...@googlegroups.com.
To post to this group, send email to k-12-f...@googlegroups.com.

To view this discussion on the web visit https://groups.google.com/d/msgid/k-12-fablabs/2435353c-144d-4ce0-800f-24718135d01f%40googlegroups.com.

For more options, visit https://groups.google.com/d/optout.

[Design Make Teach]

Fred,

Pretty sure you were part of Kacie Hultgren's Maker Training Camp: Design for Desktop 3D Printing course on Udemy. Check out lectures 27 & 28. She has some rough guidelines and design strategies for bridging.

I need to go back and review that course. Packed with some great ideas and tips.

-Josh

On Friday, January 30, 2015 at 10:29:01 AM UTC-5, fredbartels wrote: