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Try the attached file. I changed the font in your '144F' linetype to Arial. sample1.dwg

Change the Standard text style to a TTF font.

In my quick search I have found no chart for a 3.5 mm jack plug. From what I gather it's up to the manufacturer on what threads they use. I would buy one that can fit what you want to do with it and measure it and find out what threads are on it. I'm sure they will go by some kind of standard. The 3.5 mm is the size of the plug end that goes into the device "If I'm not mistaken" and has nothing to do with the housing size. I'm sure these can be picked up at home depot or other similar store.

Lineweight is applied to shp fonts. I prefer using TrueType fonts in linetypes for that reason. Experiment some characters like underscores (and a few TrueType fonts) which appear as lines in TrueType fonts are often displayed with lineweight but shouldn't affect your example. You could simply change the lineweight if that's an option. Most users & offices have different opinions of what font is used for STANDARD text style. I'd only use text styles that identify the font like "Swiss Light" "Arial Narrow" or "Romans". That way your text and linetypes should display the same for other users.

@pardonpardon A tap is used to cut a female thread and a die to cut a male thread. The threads are usually specified via an ANSI or metric (ISO) standard that classifies the thread with a nominal size of the thread diameter and number of threads per in. For example, a 1/4- 20 UNC thread means that the thread has a nominal diameter of 0.25" with 20 threads/inch and is of the Unified National Coarse configuration. ISO threads will have a designation like M8 plus a thread count. I agree with @Berzerker that you should use a tap to make the thread. Therefore you will 3D print the part with a simple cylindrical hole with a diameter less than the nominal size of the thread. The tap will cut away some of the material giving you a nice clean thread. You can search the web for what size hole to drill (3D print) for a specific thread size. I suggest you go to the fasteners aisle at a home center like Home Depot or a hardware store. They usually have samples of various thread size that you can use . Take the metal housing and find out its thread size.

Do you have a pic of what it looks like ? Is it metric, standard, machine screw, self tapping, coarse or fine thread... etc. Once you know what kind it is you pull a search for a chart on it like: ANSI https://www.engineersedge.com/thread_strength/internal_screw_threads_chart.htm Metric https://amesweb.info/Screws/metric-external-thread-dimensions-chart.aspx A set of thread pitch gauges wouldn't hurt Are you wanting to 3D print a screw ? You can buy plastic screws, bolts and nuts https://us.misumi-ec.com/vona2/mech_screw/M3301000000/M3301160000/?listDisplay=mc-photo&msclkid=8b6f01a7321712d305105e02a6f30dab&utm_source=bing&utm_medium=cpc&utm_campaign=FA - Bolts%2FFasteners%2FScrews&utm_term=%2Bplastic %2Bscrews&utm_content=Screws - Plastic

The primary challenge I think you face in 3D printing the part you describe is how well small threads can be printed with the 3D printer you will be using. In addition, determining a feasible wall thickness for the threaded portion of the object will take some experimentation. Check out this link for some tips on 3D printing threads.

Welcome pardonpardon. You can design anything you want in Autocad and yes you can export it as a STL and 3D print it. What is your level of experience with it? Although I've worked around it since the 90's I still consider myself a beginner.

If you want just Model space (setq ss (ssget "X" (list (cons 0 "INSERT")(cons 2 nam)(cons 410 "Model")))) current layout (setq ss (ssget "X" (list (cons 0 "INSERT")(cons 2 nam)(cons 410 (getvar 'ctab)))))

IDK what yr saying bc IDK how to read punctuation.

@Dana W Hehe I remember the days when people talked in full sentences and not 3 and 4 letter abreviations LOL