MakeBlock Parametric Straight Bracket

by samkass, published

MakeBlock Parametric Straight Bracket by samkass Nov 16, 2015
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2401Views 900Downloads Found in Robotics


This is a parametric bracket generator for MakeBlock which can generate parts of various sizes. All MakeBlock structural parts use M4 screws with the holes separated by an 8mm pitch, so I created this generator to generate flat parts with a specified number of holes in the x and y directions (as well as the part thickness). Most printers close inner holes up a bit, so a 2mm radius will create a part where the M4 screws "bite", and 2.4mm radius will create one where they're loose and need a nut.

You can also create longer openings within the part (such as I did in the 3x9 part) by adding the "open" row or column to the appropriate "open_" array, starting at column/row zero. For example, to make a 3x3 part with a cross in it, put 1 in the open_xs and 1 in the open_ys with rows=3 and columns=3. For multiple rows or column, separate with commas, (eg. 0,1,2). Note that you can create islands with this feature, so be careful.

MakeBlock is a hobby robotics platform which spans from kids learning bots to advanced self-balancing bots, 3-d printers, robot arms, engravers, and more.

If you create a new Thing with Customizer, please name it descriptively.

v2: Version 2 increases thickness to 3mm as per the original parts. It also has less rounding on the exterior corners. Finally, it centers the part on the origin so it transfers easily to MakerWare.
v3: Modular code. Lets you set corner radius and pitch independently. STL files are identical.
v4: Make it easier to create right-angle corners (corner_radius=0).
v5: Expose additional parameters in Customizer.
v6: Add comment for Customizer to use 2.4mm radius for "loose" parts
v7: You can now specify long open rows or columns in Customizer with a comma-separated list.

For L-Shaped Parts, see my MakeBlock Parametric L Bracket.

Print Settings

Printer Brand:



MakerBot Replicator 2










Printed with PLA, diamond infill, on unheated build plate with painters tape. Not as stiff as the metal parts, obviously, but not bad.

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Comments deleted.

These are great. I can create a customized for my class in minutes! I would like the ability to set the open/hollow area) and have holes at the each end of the part next to the open area.

That's a great idea. I don't have time in the near future to go back to this part and modify it, but I would encourage you to download the OpenSCAD files and the OpenSCAD program and poke around. I've tried to keep the code simple, and the idea of programming your way to a 3D part is appealing to me as a software guy.

This is great. It would even be more useful if one could change the hole centers from 8mm to other repeat distances, especially 1.0 cm and 0.5 cm. Still very useful as it is.

You can. Scroll down in customizer until you see "Pitch" and set it to something other than 8.

These work great for our mBot. We needed a custom piece to mount the Ultrasonic Sensor to a faceplate, and were able to design and print the piece within 15 minutes! Thank you!

No problem! I'm a big fan of the mBot for learning robotics and programming.