Written on 2025-10-31
Problem statement
Swiss kids have extensive hands-on lessons in primary school (called TTG1), where they work on all kinds of handcraft projects – pottery, papercraft, sewing machine work2, and more.
My son’s latest project is the ubiquitous sports bag that virtually all Swiss kids use for gym class – a canvas pouch that closes by pulling on the shoulder straps.
One fault I found in that design is that it slides off kids’ shoulders fairly easily.
So I set out to fix that – with a bit of 3D printing.
This is wholly deserving of the quickie tag – it was a quick job…
Solution
You know the whole:
- Sketch
- Extrude
- Possibly fillet/chamfer
Fusion360 workflow?
Yeah...
Written on 2025-10-31
Problem statement
Swiss kids have extensive hands-on lessons in primary school (called TTG1), where they work on all kinds of handcraft projects – pottery, papercraft, sewing machine work2, and more.
My son’s latest project is the ubiquitous sports bag that virtually all Swiss kids use for gym class – a canvas pouch that closes by pulling on the shoulder straps.
One fault I found in that design is that it slides off kids’ shoulders fairly easily.
So I set out to fix that – with a bit of 3D printing.
This is wholly deserving of the quickie tag – it was a quick job…
Solution
You know the whole:
- Sketch
- Extrude
- Possibly fillet/chamfer
Fusion360 workflow?
Yeah. This was exactly that kind of job:
Sketch
Sketch the basic 2D shape
(with some model params)
Extrude
Extrude the basic shape
Fillet/chamfer
Fillet + chamfer (to cut sharp corners)
As a stretch goal, I added some personalization (an engraved name):
Finished model
Here’s the final result (sans the personalization, since you probably don’t want that):
[Right here should have been an interactive 3D model.]
The stl file as well as the f3d design file can be yours for the little price of free, under CC – BY NC SA license3.
Printing
It took two tries to get the dimensions just right (I designed the whole thing based on a rough measurement of the lanyard diameter), but the result turned out pretty cool, no?
The bag Alan sewed professionally, with the quick-hack clip I cobbled together in Fusion 360. ;)
Closing words
I don’t know – silly things like this remind me how much I enjoy living in a century where going from an idea to a finished “product” takes just a few keystrokes and a 30-minute wait4.
Textiles & Technisches Gestalten ↩ 1.
No kidding. They all (probably) sew better than I can. ↩ 1.
The non-commercial bit because I don’t want to get into hot water with Autodesk since my license is the free hobbyist one. Not that you could commercialize a trivial model like this… ↩ 1.
On my ancient Ultimaker 2+. I’m sure Prusa’s new would’ve done a much quicker job of it. Maybe even with better surface finish. ↩