I am fond of Scale. But there is a question on the usage: When I want to make a hollow object, with predefined wall thickness, I design the object and Difference it with a scaled smaller copy, that is translated in Z, to a defined altitude that reflects the wall thickness on the build plate. However, the thickness of other walls: left, right, front, rear and top , (or with more complex objects all other outside surfaces) is depending on the scale parameters. Can I calculate the thickness as a function of both the original size and the desired thickness, to get the scale parameter ? Thomas https://reprap.org/forum/read.php?313,732793,732793#msg-732793 Mon, 16 Mar 2026 23:47:34 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?313,732793,742450#msg-742450 https://reprap.org/forum/read.php?313,732793,742450#msg-742450 this other thread I proposed a simple implementation of the Minkowski difference using the Minkowski sum on the "negative" (i.e. a cavity) of the original object...]]> enif OpenSCAD Thu, 26 Jan 2017 09:54:11 -0500 https://reprap.org/forum/read.php?313,732793,732955#msg-732955 https://reprap.org/forum/read.php?313,732793,732955#msg-732955
Your solution gives me a hard time programming internal ribs and supports in the hollow shape, as far as I can think-up now.

But I will keep it in mind designing. Thanks]]> Replace OpenSCAD Sun, 25 Dec 2016 07:01:37 -0500 https://reprap.org/forum/read.php?313,732793,732872#msg-732872 https://reprap.org/forum/read.php?313,732793,732872#msg-732872
What you would need to do this computing the Minkowski difference of you object and a sphere with a radius equal to the wanted wall thickness and subtract the result from the original object. But, unfortunately, OpenScad only implements the Minkowski sum, not the difference... :(

The only "easy solution" I could see, is to let the slicer do the work by printing the full object with a 0% filling and the number of shells and top/bottom layers that correspond to the desired wall thickness.]]> enif OpenSCAD Sat, 24 Dec 2016 09:58:48 -0500 https://reprap.org/forum/read.php?313,732793,732793#msg-732793 https://reprap.org/forum/read.php?313,732793,732793#msg-732793 But there is a question on the usage:

When I want to make a hollow object, with predefined wall thickness,
I design the object and Difference it with a scaled smaller copy, that is translated in Z, to a defined altitude that reflects the wall thickness on the build plate.

However, the thickness of other walls: left, right, front, rear and top , (or with more complex objects all other outside surfaces) is depending on the scale parameters.

Can I calculate the thickness as a function of both the original size and the desired thickness, to get the scale parameter ?



Thomas]]> Replace OpenSCAD Sat, 24 Dec 2016 01:18:22 -0500