Bridge and Overhang Mashup
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This is a print test and demo for the constraints that come from unsupported overhangs and bridges.
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Model information
- Source
- Printables
- Category
- Test Models
- License
- Creative Commons — Attribution — Noncommercial
This is a print test and demo for the constraints that come from unsupported overhangs and bridges. You can print this as a demo for students to remind them of the constraints of FDM printing and design.
This is a remix of https://www.thingiverse.com/thing:2593077 and https://www.thingiverse.com/thing:40382
Print one without supports to show what happens when overhangs are greater than 45 degrees. Print a second with supports from the build plate to show the difference supports can make.
Make sure to emphasizes that supports will leave a rough surface, and cost more time and materials. If you have a dual extruder, you can show how water-soluble supports work. Orient the overhang side to face the cooling fans on your specific printer for best results.
I hacked them together in TinkerCAD.
Print instructions
Category: 3D Printing Tests Print Settings
Printer Brand: LulzBot
Printer: TAZ 5
Rafts: Doesn't Matter
Supports: No
Resolution: 0.3 - 0.3
Notes:
Leave rough, do not sand or process.
Post-Printing
Leave rough to show unsupported overhangs and bridges
How I Designed This
This is a TinkerCAD hack
Overview and Background
Demo
When you have your students design items for 3D printing, use this to show them the constraints that come from unsupported overhangs and bridges.
Show them that they can have overhangs to 45 degrees before the surface quality decreases. Show that bridges can go only so far before the filament strands sag.
Print one unsupported, and the 2d supported from the build plate. You can also print with a brim / skirt and raft to also show the different types of build plate support.
You can time laps the printing to show the constraints and what happens when your overhang is not supported past 45 degrees, or bridge goes past 10 mm. This can be a demo piece to match the 3D printing handbook published by 3DHubs.
Lesson Plan and Activity
Print 2-4 samples, and pass around to show how print quality degrades with steep overhangs and long bridges.
Skills Learned
- supports
- bridging
- overhang
- restrictions
constraints
Preparation
Print 2-4 sets per class to be passed around. Do not clean or process the print, leave all loose strings and rough edges on this to show what happens with steep overhangs and long bridges.