Any Size Parametric 90 Degree Shelf Bracket / Corner Bracket. Imperial & metric!
Description
PDFThis is a simple yet versatile parametric 90 degree bracket. This bracket can be re-sized for virtually any need via the OpenSCAD parameters. The bracket can also be set to 3 different styles; Normal Bevel, Low Poly, and Extra Low Poly.
I have pre-generated STLs for a set of imperial sizes from 1x1 to 8x8 inches that use #4, #6, or #8 screws. See the table below for the sizes and screw placements/measurements. I will be adding more pre-generated metric STLs over the next week.
If you want to create a custom size, I have uploaded the OpenSCAD file that you can use to change the parameters. You can modify the height, length, width, screw hole placement and size, screw head size, and poly style, and more. I have also uploaded the .json file that contains the settings for the pre-generated STLs listed below.
NOTE: The OpenSCAD file is not perfect :-/ Sorry, but it take too much time to be perfect. If you make a setting too big or too small you might get something that doesn't even look like a bracket. However, you can use the settings in the .json file as a starting point. I needed to upload this as a txt file, so to use it, you'll need to rename it to 90DegreeBracket.json if you want the “Parameters” tab to display in OpenSCAD.
NOTE #2: Yes, I know the normal bevel style takes a looooooonnnnnnnggg time to render(like 5 minute sometimes) :-(. Sadly OpenSCAD has some mesh issues sometimes, so I needed to use a very large polygon count to get everything to line up correctly :-/. I'll try to fix the rendering time later after I make a few other enhancements.
Pre-Generated STLs
Imperial
| Bracket Size | Bracket Width | Styles | Screw Size | Screw 1 Placement | Screw 2 Placement |
| 1x1 Inch | ¾ inch | Normal Bevel, Low Poly, Extra Low Poly | #4 or #6 | 5/8 inch | None |
| 2x2 Inch | ¾ inch | Normal Bevel, Low Poly, Extra Low Poly | #4 or #6 | 5/8 inch | 1 5/8 inch |
| 3x3 Inch | ¾ inch | Normal Bevel, Low Poly, Extra Low Poly | #4 or #6 | 7/8 inch | 2 ½ inch |
| 3x6 Inch | ¾ inch | Normal Bevel, Low Poly, Extra Low Poly | #4 or #6 | 3 inch side: 6 inch side: | 3 inch side: 6 inch side: |
| 4x4 Inch | ¾ inch | Normal Bevel, Low Poly, Extra Low Poly | #6 | 1 inch | 3 3/8 inch |
| 6x6 Inch | 1 inch | Normal Bevel, Low Poly, Extra Low Poly | #6 or #8 | 1 ½ inch | 5 inch |
| 6x8 Inch | 1 inch | Normal Bevel, Low Poly, Extra Low Poly | #6 or #8 | 6 inch side: 8 inch side: | 6 inch side: 8 inch side: |
| 8x8 Inch | 1 inch | Normal Bevel, Low Poly, Extra Low Poly | #8 | 2 inch | 7 inch |
Metric
| Bracket Size | Bracket Width | Styles | Screw Size | Screw 1 Placement | Screw 2 Placement |
| 20x20 mm | 20 mm | Normal Bevel, Low Poly, Extra Low Poly | M3 or M4 | 12 mm | None |
| 20x40 mm | 20mm | Normal Bevel, Low Poly, Extra Low Poly | M3 or M4 | 20 mm side: 40 mm side: | None |
| 30x30 mm | 20 mm | Normal Bevel, Low Poly, Extra Low Poly | M3 or M4 | 10mm | 22 mm |
| 40x40 mm | 20 mm | Normal Bevel, Low Poly, Extra Low Poly | M3 or M4 | 15 mm | 32 mm |
| 40x60 mm | 20 mm | Normal Bevel, Low Poly, Extra Low Poly | M3 or M4 | 40 mm side: 60 mm side: | 40 mm side: 60 mm side: |
| 60x60 mm | 20 mm | Normal Bevel, Low Poly, Extra Low Poly | M3 or M4 | 20 mm | 50 mm |
If you find anything wrong with the tables above, please let me know so I can fix it. Thanks!
Printing
I recommend printing these flat with a few pain on supports inside the screw access slot in the angle support. See images for an example.
Otherwise, use your discretion on fill and perimeters depending on how strong you need them to be.
Change Log
2024-09-22:
- Added 20x40, 40x60, and 60x60 mm brackets.
- Fix a small issue that was leaving a small amount of material behind after the screw hole access cutout was completed. Was only and issue in a small amount of situations… :-/ But I should have caught it sooner…
- Updated the 90DegreeBracket.json settings file. Which remember is uploaded as 90DegreeBracket.txt since Printables doesn't allow *.json uploads.
2024-09-15:
- Noticed the #8 screw holes were a little undersized. Made them a little larger.
- Updated the 90DegreeBracket.json settings file. Which remember is uploaded as 90DegreeBracket.txt since Printables doesn't allow *.json uploads.
2024-09-14:
- Added 20x20, 30x30, 40x40 mm STLs.
- Fixed a small issue in the scad file where it was possible to create an un-renderable STL due to a cutout not being wide enough and leaving a “skin/layer” behind.
- Updated the 90DegreeBracket.json settings file. Which remember is uploaded as 90DegreeBracket.txt since Printables doesn't allow *.json uploads.
Tags
Model origin
The author marked this model as their own original creation.
