Injection method to increase z direction strength

[treesess]

z direction strength is always a big problem, 100 infill won't get you great strength, especially for a small part.

Here is a promising solution:

1. identify the part you want to increase the z strength (either automatically or let the user can add a modifier to the model);
2. for this part, only print the wall with zero infill (or very low infill).
3. turn off the part fan and heat up the nozzle 20℃ more (depending on filament type), using MAXIMUM flow rate to extrude/inject the hollow space inside the wall.
4. iron the top surface of this part after injection if the surface is not smooth enough, or keep printing the rest of the model traditionally.

in my opinion, it will be pretty useful to improve the z strength of thin walls (2~3 mm) in a model. Also, the buckle design can benefit from this method a lot i guess.

i'd try it myself to prove the feasibility, but due to my level of coding skills, it may take some time...

[treesess]

I tried a feasibility test and filmed the printing. Check out here: https://www.youtube.com/watch?v=46JZ5wX1wbg

Hope this way could be further developed. I will keep trying and do some mechanical tests to see if how it works.

[treesess]

And here goes the bending test: https://www.youtube.com/watch?v=1TZ2HgQN5zs

16 kg vs. 13.5 kg. Not bad for the first trial. Will try some more and do better tests on MTS later. Maybe.

[treesess]

did another batch of tests, sad that no valid useful conclusion this time, but still put it here fyi: https://www.youtube.com/watch?v=nt1GokmUJrU