Simple Flexible Strap ("FlextrUp") to mount anything anywhere

Flexible strap to quickly mount and securely tie anything anywhere.
Very strong, reliable, yet easy to manipulate, reusable.
Model updated (ver. 2) to improve the layer adhesion in the most critical area at the base of the hooks.

Material & Properties:
- The example on the pictures are printed from flexible TPU (30D on Shore scale), 100% infill. Any harder flexible material will do too, will be just a bit more rigid and not so stretchy.
- Width 13mm, length 300mm (it can diagonally fit on the print bed), thickness 1.8mm.

Max Load:
I did destructive experiments with parts printed from TPU FiberFlex 30D material. The results measured when repeatedly loading the enclosed loop:
- Optimal load is up to 10kg-force (98N, 22lbf {poundal-force US}). It remains fully flexible, the permanent deformations are less than 1.5% of the length.
- Maximum load is up to 15kg-force (147N, 33lbf) . It's still flexible, the permanent deformation up to 6.5% of the length. The strap remains fully usable but can become a bit pulled up.
- Overloading leads to large permanent deformations of 33% at 20kg (196N, 44lbf), and 80% at 25kg (245N, 55lbf). Repeated overloads by 25kg and higher lead to material destruction.

Model Evolution & Background story:
I was tired of the heavy tool-bag rattling behind my saddle on my enduro bike when riding in the bumpy off-road terrain.
So I prototyped a simple flexible strap (I call it "FlextrUp") to secure and tighten it in place. No more rattling, no more lost tool-bag.
It took few iterations, now it perfectly fits my needs.
Honestly, I was surprised how stretchy, strong and reliable the strap went.
Despite it's simple design, it never self-opened, never failed. It's quite strong.

Accessories:
For mounting accessories please follow my other models:
- See Holder to attach FlextrUp by double-sided tape to smooth surface

Not sure how to print the soft TPU?
Here you can get the full print profile for Bambulab X1C to print this model from FiberFlex 30D material. (Just download the *.3mf file, open it, hit "Print". That's it.).

Side note:
- If you like the design and want to pump some energy into my next projects, you can buy me a coffee at ko-fi . Thanks.
- See my other models: Flexible mesh pocket

Updates & Edits:
Ver.2: Fixed issue about some prints occasionally had suffered insufficient layer adhesion at the most critical area at the base of the hooks. It was caused by the too long delay between extruding the two critical layers while waiting for finishing and ironing the large top surface. Printing multiple pieces together prolonged this delay even worse.
Model and printing instructions has been updated to completely fix this. The most critical layers junction prints in short time without any delay now, it's now a bit higher than the large slow-printed surface. The most critical corner has been filleted too. That fixed the issue completely so far. I've experience no more issues after this update.

Plans TO DO:
- Conduct destructive experiments [DONE]
- Design some additional adapters to mount some gear. For example mount a torch on the handlebars, secure stuff inside the motorcycle top-box, etc.
- Design various sizes for different applications.

• Please let me know ideas & wishes in the comments...

Finished prints for sale:
Struggling with the print? Or you just don't have the whole spool of the desired material / color on hand? No problem, you can buy the ready-made prints on the website of our workshop: https://www.ma3d.cz/obchod. For custom colors and shipping outside the Czech Republic, please contact me, we can solve it individually.

• Flexible TPU (30D of Shore works best for me)
• 100% infill, nozzle 0.4mm, layer height 0.2mm
• Printed without supports (I really wanted to avoid supports, as removing them with the soft sticky TPU can be a tedious work)
• Simple postprocessing. The overhang is supported by the tiny built-in block, which you can easily cut out. See pictures.
• To improve the strength in the most critical points, check in your slicer, the lines in the top layer around the base of the hooks are oriented parallel along the long axis. See the Layers.PNG attached.
• To optimize strength, printing one object at a time without ironing the top surface is recommended. Prolonging delays between printing layers might result in compromised layer adhesion. But I admit, this effect depends on your printing conditions and used material. (I had no issues when printing up to three pieces at one bed.)