To aid the continuing growth of open source tools in the research community, this thesis presents two broadly useful instruments which can be built and operated for a fraction of the cost of equivalent or inferior commercial products. A scanning electron microscopy (SEM) fractographic analysis was carried out to better understand the failure mechanism and material structural changes in tensile loaded, accelerated aged parts. Part stiffness did not change significantly following the UV-B exposure and creep behavior was closely connected to the decrease in mechanical properties. ![]() After irradiation, PLA and PETG parts saw significant decreases in both tensile strength (PLA: −5.3% PETG: −36%) and compression strength (PLA: −6.3% PETG: −38.3%). Both the tensile and compressive strengths were determined, as well as changes in material creep characteristics. Samples 3D printed from these materials went through a dry 24 h UV-B exposure aging treatment and were then tested against a control group for changes in mechanical properties. This paper analyzes the effect of accelerated aging through prolonged exposure to UV-B on the mechanical properties of parts 3D printed from the commonly used polymers polylactic acid (PLA) and polyethylene terephthalate–glycol (PETG). In the past few years, 3D printing has seen an increased usage in fabricating parts for functional applications, including parts destined for outdoor use. ![]() There are a few published modules for the latter and I have an unpublished one I prefer.In outdoor environments, the action of the Sun through its ultraviolet radiation has a degrading effect on most materials, with polymers being among those affected. You can either derive the cross section for your thread profile (can be done with OpenSCAD code) then linear_extrude it with twist (needs really fine division to be accurate though) or skin a polyhedron for the thread. Note that there's no canonical module for doing threads in OpenSCAD. You just have to decide how to size and position them for your model yourself. as well as (union) attaching external threads. You can use CSG operations (intersection or difference) to cut the model, cut a compartment out of it, cut threads in it, etc. On the other hand, doing it manually is rather easy. So automation of this entirely in OpenSCAD is really not an option. It has a decent functional language for expressing geometry in terms of parameters and functions/modules, but the road is one way geometry is an output only and doesn't loop back into input. OpenSCAD lacks any facilities to perform computations on the resulting geometry (derived from CSG or directly imported). I'm thinking a few simple yet potent lines of OpenSCAD code or a FreeCAD script should do the trick but my knowledge is limited in this field at the moment so any input is highly appreciated. a cylindrical hidden compartment or a space where specific user-made modules fits into) Make a hollow compartment inside the model with working 3D-printable threads sticking out from one part fitting into the other with definable shape, tolerance & size in relation to the parts size (eg. slicing a model in half & keeping both parts separate) Split any given model at X height with Y angle Z times (eg. ![]() So I thought the best way of achieving this in a streamlined semi-automated manner is creating a simple script in OpenSCAD / FreeCAD and I would love some professional input on how to achieve this exact process: secret compartments, modules like salt/pepper shakers, etc. I had a thought the other day that it's 100 % waste to have either a solid or hollow 3D-printed model in relation to utilizing the space inside of it for different modules, e.g.
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