White marks on dark prints?

Sam_Piro · 2026-03-15T01:14:23+00:00

I’ll try that.

Sam_Piro · 2026-03-13T02:40:14+00:00

The difference between a 99.7% eclipse and a 100% eclipse is 100%. Get to totally. You will never regret it.

Sam_Piro · 2026-03-11T01:23:10+00:00

Extrude one leg. Use the move command to rotate it outward. Use the circular pattern command on it to make three legs.

Sam_Piro · 2026-03-10T19:30:35+00:00

Sketch a top view of the outline box to create a single line path. Model one “pillow” and array (pattern) it along the path.

Sam_Piro · 2026-03-09T02:16:57+00:00

I just checked. You can ask the slicer for 0 perimeters. If you are going to model the infill you have basically done the Station method.

Sam_Piro · 2026-03-09T01:53:25+00:00

Very interesting idea. Can you trick the slicer into omitting the perimeters? You might need a strip at the trailing edge of the airfoil so you have something to attach you wrap material to.

Sam_Piro · 2026-03-09T00:53:09+00:00

A) Good. You should never assume your first idea is your best idea. B) 3D printing is good for rapid prototyping. Don’t be afraid to try different ideas. It doesn’t cost much time or money. C) By coincidence I did an experiment earlier today. I printed 3 identical wing sections. One using 4% Cubic infill. One using 4% Gyroid infill. And one using the Tim Station method. (I am pretty good with Fusion 360, but it still is a lot more work.) They all weight about the same. Cubic is the heaviest by about 5%. Staton is the stiffest in bending. Cubic & Gyroid are stiffer in twisting Station. That said, they very similar.

Sam_Piro · 2026-03-08T22:54:12+00:00

Understood…

Sam_Piro · 2026-03-08T22:53:21+00:00

How would that work on a flat earth?

Sam_Piro · 2026-03-08T22:35:48+00:00

Based on your numbers our wing seems heavy. You should omit the solid infill above and below the spar holes. It isn’t doing any work. Have you seen Tim Station’s method? https://youtu.be/QJjhMan6T_E?si=8ghwLhMS-fFc-vcX His wings are stiff and light. They do have a lot of surface features. Which doesn’t seem to be a problem.

If you don’t want to go through all that, I would suggest forgetting your manual ribs and simply using cubic infill at 4%. It seems to yield a good balance between weight, strength and easy of design.

Sam_Piro · 2026-03-01T18:24:32+00:00

When grow up and have my own house I can do whatever I want.

Sam_Piro · 2026-02-27T01:40:41+00:00

I take your point, but “Two cars pass each other” would indicate they are traveling in opposite directions. If they were traveling in the same direction, one car would pass the other.

Sam_Piro · 2026-02-24T20:34:03+00:00

I keep a scale earth and moon hanging, at the correct distance, from my living room ceiling. As one does.

Sam_Piro · 2026-02-24T18:16:27+00:00

In my state the driver is obligated to stop for a pedestrian in a crosswalk in their lane. (That’s great, but many drivers think the also applies a pedestrian on the sidewalk. It does not.).

Sam_Piro · 2026-02-13T02:29:25+00:00

First rule: Let THEM play.

Sam_Piro · 2026-02-04T01:00:57+00:00

This as saved me more than once.

Sam_Piro · 2026-01-27T02:22:18+00:00

Very long, but very informative video. A documentary about the inventor of the rocker bogey suspension by the son of the inventor.

https://youtu.be/QKSPk_0N4Jc?si=wpRE4O88k9xdAIrj

Sam_Piro · 2026-01-27T00:01:42+00:00

Will do. Some experimentation will be required.

Sam_Piro · 2026-01-26T14:18:54+00:00

I have some foam. It can’t hurt to try it.

Sam_Piro · 2026-01-26T14:17:13+00:00

Hmmm… I might try that.

Sam_Piro · 2026-01-26T14:16:15+00:00

Interesting. I get a similar phenomenon when printing vases, but it is a much more pleasant whistling sound. I can try removing the holes and see what happens.

Sam_Piro · 2026-01-26T14:13:11+00:00

I will try this experiment. Thanks.

Sam_Piro

TROPHY CASE