author
52Instructables265,847Views315CommentsMy basement in Oklahoma, USJoined February 1st, 2017
Formerly the owner of a company that designed software for avionics (EFIS, FMS, etc.) and video games (Tetris, Robocop, Predator, Michael Jordan in Flight, and a number of others), I'm now retired and finally have the time to design, print, assemble, test and publish 3D models for my kids, grandkids and, hopefully, you and yours to enjoy. See all of my videos here: https://www.youtube.com/user/popzct0214/videos.

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Untouchable Challenge
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  • gzumwalt commented on gzumwalt's instructable Perseverance, Petite10 days ago
    Perseverance, Petite

    Thanks Martin, I'm glad you liked it!None of the threads are left handed that I recall. Did you perhaps mirror a component with the slicer?Sorry for the problems.Greg

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  • gzumwalt's instructable Fab Lab Tulsa 1 (FLT1)'s weekly stats: 11 days ago
    • Fab Lab Tulsa 1 (FLT1)
      3,656 views
      61 favorites
      3 comments
  • gzumwalt's instructable Fab Lab Tulsa Paddle Boat's weekly stats: 11 days ago
    • Fab Lab Tulsa Paddle Boat
      190 views
      0 favorites
      0 comments
  • gzumwalt's entry Marblevator Mini, Loop. is a winner in the Make it Move Contest contest 12 days ago
  • gzumwalt commented on gzumwalt's instructable Fab Lab Tulsa 1 (FLT1)13 days ago
    Fab Lab Tulsa 1 (FLT1)

    No problem at all!The printers I use do print quite small and accurate but I’m not sure how well the materials I use would remain attached to the copper during an etchant bath.Using the materials on light sensitive PCBs may work better, you’d just have to print in a darkroom environment .Ultimaker told me there is conductive filament available (not from Ultimaker), but from my understanding, it is resistive but I don’t recall an “ohms per inch” value.Good luck, and keep me informed of your progress, sounds very interesting!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird14 days ago
    Hummingbird

    Sorry you are having difficulties with this model.Did you print the gears on a raft?If so, try scaling down the X, Y plane of the gear (not the Z) by a very small amount, print two gears, then try them on the model (you may have to slightly enlarge the hole for the axle).Hope this helps.Greg

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  • gzumwalt commented on gzumwalt's instructable Complaint Button.14 days ago
    Complaint Button.

    Thank you, I'm glad you liked it!Greg

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  • gzumwalt's entry Marblevator Mini, Loop. is a finalist in the Make it Move Contest contest 16 days ago
  • gzumwalt commented on gzumwalt's instructable Apple Coin Bank18 days ago
    Apple Coin Bank

    “This is a work of fiction. Any resemblance to actual persons, movie characters, etc., living or dead, is purely coincidental.”:)Greg

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  • gzumwalt's instructable Apple Coin Bank's weekly stats: 18 days ago
    • Apple Coin Bank
      664 views
      7 favorites
      0 comments
  • gzumwalt commented on gzumwalt's instructable Apple Coin Bank19 days ago
    Apple Coin Bank

    Thank you very much, I'm very happy you enjoyed it!Greg

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  • gzumwalt commented on gzumwalt's instructable Dual Mode Windup Car21 days ago
    Dual Mode Windup Car

    When you say "freeze", you mean your printer just stops?What printer are you using?

    That depends on what you mead when you say it "stops about half way". Is your printer air printing? Does it freeze up? Is the model skewing?First, using Cura, place the viewport mode in "layer view" the, using the vertical slider, make sure Cura t is producing a slicing pattern suitable for your printer.Next, if it is air printing, then it's more than likely a nozzle or filament feed issue.And finally, if the model is skewing, then it is more than likely a printer issue (loose belt, loose build plate, etc.).I'm not sure which it is, but hopefully with a little more experimentation we can fix the issue.Sorry about the problems you have had with this model.Greg

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  • gzumwalt entered Apple Coin Bank in the Make it Move Contest contest 25 days ago
  • gzumwalt commented on gzumwalt's instructable Marblevator Mini, Loop.5 weeks ago
    Marblevator Mini, Loop.

    Thank you very much, I'm glad you enjoyed it!I do tend toward mechanical designs with "some assembly required".Thanks again,Greg

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  • gzumwalt commented on gzumwalt's instructable WiFi Kit 32 NTP Clock7 weeks ago
    WiFi Kit 32 NTP Clock

    The libraries have the same names as the ".h" files, thus you will need to add "time.lib", "WiFi.hlib, "WiFiUdp.lib" and "U8g2lib.lib" to your sketch. On a Mac, these libraries are located in "Documents/Arduino/libraries".Hope this helps!Greg

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  • gzumwalt commented on gzumwalt's instructable Marblevator, Mechanisms.7 weeks ago
    Marblevator, Mechanisms.

    Hi Jim,I believe the only tutorial I created using Autodesk Fusion 360 was this: https://www.instructables.com/id/The-Design-of-Cy... and it's really not that good.I'll see what I can do for a marble machine tutorial, maybe even this one.Thanks for your question, and if you have any more, just ask and I'll do my best to answer it!Greg

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  • gzumwalt's instructable Marblevator Mini, Loop.'s weekly stats: 7 weeks ago
    • Marblevator Mini, Loop.
      4,160 views
      87 favorites
      14 comments
  • gzumwalt commented on gzumwalt's instructable Marblevator Mini, Loop.7 weeks ago
    Marblevator Mini, Loop.

    Comments such as yours are inspirations themselves, and I cannot thank you enough for your kind words, and am glad you enjoyed this, and my other models!Greg

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  • gzumwalt commented on gzumwalt's instructable Marblevator Mini, Loop.7 weeks ago
    Marblevator Mini, Loop.

    Thank you very much, I’m glad you enjoy them!Greg

    Thanks, I'm glad you do!Greg

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  • gzumwalt commented on gzumwalt's instructable Marblevator, Mechanisms.7 weeks ago
    Marblevator, Mechanisms.

    Thanks yet again Donald! I am very excited to see your results!Except for the threaded components (you may require a tap and die set) this model assembles easy and runs great.Greg

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  • gzumwalt commented on gzumwalt's instructable Marblevator Mini, Loop.7 weeks ago
    Marblevator Mini, Loop.

    Thank you very much, I’m glad you enjoyed it!I was truly surprised at how fast and reliable the short looped track is!Greg

    Many thanks Donald, I always highly appreciate your input!

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  • gzumwalt entered Marblevator Mini, Loop. in the Make it Move Contest contest 8 weeks ago
  • gzumwalt's instructable Marblevator, Mechanisms.'s weekly stats: 8 weeks ago
    • Marblevator, Mechanisms.
      384 views
      3 favorites
      2 comments
  • gzumwalt commented on gzumwalt's instructable Marblevator, Mechanisms.2 months ago
    Marblevator, Mechanisms.

    Thanks! It's a fairly simple print and assembly, and mine has run for a week without dropping a marble!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird2 months ago
    Hummingbird

    That looks awesome, congratulations !Greg

    Thank you so very much for your kind words, I'm truly glad you enjoyed it!Greg

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  • gzumwalt's instructable Complaint Button.'s weekly stats: 2 months ago
    • Complaint Button.
      5,680 views
      58 favorites
      10 comments
  • gzumwalt commented on gzumwalt's instructable WiFi Kit 32 NTP Clock2 months ago
    WiFi Kit 32 NTP Clock

    I’ve had a lot of fun using this board, good price also.

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  • gzumwalt commented on gzumwalt's instructable Hummingbird2 months ago
    Hummingbird

    thank you so very much, I’m pleased you enjoyed it!

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  • gzumwalt commented on gzumwalt's instructable Complaint Button.2 months ago
    Complaint Button.

    Thanks, that’s why I enjoy this!

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  • gzumwalt commented on gzumwalt's instructable Horse, Prototype2 months ago
    Horse, Prototype

    Unfortunately, I cannot seem to find the manner in which to export CAD or DXF if Autodesk Fusion 360. If anyone can direct me to the procedure, I'll do my best.Greg

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  • gzumwalt commented on gzumwalt's instructable Complaint Button.2 months ago
    Complaint Button.

    I've uploaded "Base Plaque Left Blank.stl" and "Base Plaque Right Blank.stl".Please let me know how they work out.Greg

    Thanks, I'm glad I received a smile from this model!Greg

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  • gzumwalt commented on gzumwalt's instructable Complaint Button.2 months ago
    Complaint Button.

    Thanks!I most certainly will! I’m away from my office right now but I can easily upload them tomorrow. Just to make sure, you want just the plaque background with no text, correct?Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird2 months ago
    Hummingbird

    That depended on the color for the ball joints. When I printed the first model using Ultimaker Transparent PLA, there was no "oozing" and the ball was almost exactly 6mm. In this case I use the 2.2 mm version which, being thicker, has a larger surface area between the rod and ball. When using certain other colors, white for example, there was some oozing and the ball was slightly larger than 6mm I used the 1.2mm in these cases.Hope that helps!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird2 months ago
    Hummingbird

    Thanks!I'm truly sorry you're experiencing difficulties with this model. The ball joints are perhaps the most precise parts in this model. Try scaling the arm down very, very slightly on the X and Y dimensions, but not the Z (thickness) axis.Hope this helps!Greg

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  • gzumwalt commented on gzumwalt's instructable Heltech WiFi Kit 32 Based Network Scanner2 months ago
    Heltech WiFi Kit 32 Based Network Scanner

    Thank you very much!I have yet to create a web radio, but keep watching, I may do so soon!Thanks again,Greg

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  • gzumwalt's instructable Horse, Prototype's weekly stats: 2 months ago
    • Horse, Prototype
      4,593 views
      75 favorites
      12 comments
  • gzumwalt commented on gzumwalt's instructable Horse, Prototype2 months ago
    Horse, Prototype

    Lora and I are attending the Rapid conference in Fort Worth this week (rapid3devent.com) with Ultimaker. If you’re interested in the future, you should attend with us. Ultimaker’s new S5 printer is stunning!

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  • gzumwalt commented on gzumwalt's instructable Horse, Prototype2 months ago
    Horse, Prototype

    Thank you, I hope you enjoyed it!

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  • gzumwalt commented on gzumwalt's instructable Horse, Prototype2 months ago
    Horse, Prototype

    Hope this is who I think it is...What, you didn’t like this: https://www.instructables.com/id/Hummingbird/???Hi Geoff!

    Thank you very much!I do not, but if Autodesk Fusion 360 can export in either of those formats, I’ll see what I can do. I also have grandkids, I know that feeling!Greg

    I developed the leg motions myself. I used software I had written (https://www.youtube.com/watch?v=TbzAQyXUwXs) for Saber and Saber 2 (https://www.instructables.com/id/Saber-2/), Grashofs laws of 4 bar linkages, Autodesk Fusion 360 joints and joint animations, as well as a healthy dose of trial and error! Hope this kinda helps. And thank you very much, I’m very pleased you enjoyed this model. Greg

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  • gzumwalt commented on gzumwalt's instructable Saber 23 months ago
    Saber 2

    Sorry yet again, I am away from my computer right now, but if I recall there is only 1 AxleGearDrive.stl (connects the motor to the gear train), 5 AxleGearLeft.stl (used to connect the left side control arms to the gear train), 5 AxleGearRight.stl (used to connect the right side control arms to the gear train), and 10 AxleGearIdler.stl (for those gears without control arms).I'll examine the PDF when I return.

    No, that would be AxleGearDrive.stl. AxleGearRight.stl and AxleGearLeft.stl are used in combination with SpurGear(16 teeth).stl to form the mechanism that animates the legs.AxleGearDrive.stl connects the motor to the gear train.

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  • gzumwalt commented on gzumwalt's instructable WiFi Kit 32 NTP Clock3 months ago
    WiFi Kit 32 NTP Clock

    Congratulations, great work!Greg

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  • gzumwalt commented on gzumwalt's instructable Saber 23 months ago
    Saber 2

    You are very welcome!Yes, I believe that is correct.

    I'm truly sorry about that, I believe I uploaded the correct file into Step 1, AxleGearRight.stl".Again, truly sorry.Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    If you’d like, I would be happy to upload the body halves, wings and stem in Autodesk Fusion 360 format.

    As noted, I'm using Cura 3.2.1 as well on Ultimaker 2+ Extended and Ultimaker 3 Extended printers. I haven't a clue as to why your experiencing this, but you might try the "Enable gradual" infill option that should increase the infill as the model height increases.Sorry for the problems.

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    Thank you very much, and you are very welcome, I’m truly happy that you enjoyed it!

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    Hi ntiong,Thank you very much for your kind words!Regarding the workflow for Hummingbird, as I mentioned in the introduction, my wife truly enjoys feeding and watching hummingbirds as they pass through, so I decided to create Hummingbird for her to watch during the hummingbirds "off season". I started the design using the numerous photos we've taken of the hummingbirds. I imported a few select photos into Autodesk Fusion 360 using the Canvas function then outlined the various body components (body, wings and tail) using the Autodesk Fusion 360 spline function. Next, after studying the wing motion of a "typical" hummingbird, I decided to use a captured ball joint (somewhat similar to a helicopter swash plate) for the pivot and rotate mechanism, and since I try to m...

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    Hi ntiong,Thank you very much for your kind words!Regarding the workflow for Hummingbird, as I mentioned in the introduction, my wife truly enjoys feeding and watching hummingbirds as they pass through, so I decided to create Hummingbird for her to watch during the hummingbirds "off season". I started the design using the numerous photos we've taken of the hummingbirds. I imported a few select photos into Autodesk Fusion 360 using the Canvas function then outlined the various body components (body, wings and tail) using the Autodesk Fusion 360 spline function. Next, after studying the wing motion of a "typical" hummingbird, I decided to use a captured ball joint (somewhat similar to a helicopter swash plate) for the pivot and rotate mechanism, and since I try to make my designs 100% 3D printed, I designed a test fixture to determine the minimal size ball joint I could reliably 3D print, which ended up being a 6mm ball and a 6.3mm hole. With these two dimensions, I was then able to scale the body, wings and tail outlines I had traced earlier to a size suitable for the wing motion mechanism. With the scale (size) determined, I next designed the gear train for the hummingbird body using the Autodesk Fusion 360 Gear add-in, then printed and assembled the first body and wing prototype which ended up looking like this: Next was the base design. In order to move the hummingbird fore and aft, I decided on a ratio of 6 wing flaps to 1 complete fore / aft cycle. This required a gear reduction which also provides the increased torque required for the fore and aft body motion. The first base design used a gear train to connect the body to the base and maintain a level pitch, and ended up looking like this:As I noted in the Youtube video comment section, I wasn't pleased with the smoothness (more correctly lack thereof) of the fore and aft motion with this base design, so I redesigned the base mechanism using a parallelogram to connect the body to the base to facilitate the fore and aft motion.Finally, the flower is my interpretation of the plastic flowers on the humming bird feeders my wife uses, and the stem was designed to position the flower at the correct point.Hope this helps, and if you have any further questions, just ask!Greg

    Hi ArielB10,I'm sorry but I don't know! At my age, I've simply had many years experience tinkering with gears and mechanisms, and used some of our photographs and videos as a guideline to combine the gears with a hummingbird, and this was the result! You may try searching for gears and mechanisms on the web. I would try and search for "Autodesk Fusion 360 Gears" for example to study gears.Hopefully someone else here can direct you to an appropriate answer.Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    Thank you very much, I'm truly glad you enjoyed this model!Regarding the power source, I use a "power jack" soldered to the motor matching the size and style of the plug on the power supply (I use ac to dc wall mount style power adapters), but you may just as well solder the power supply wires directly to the motor. Just make sure the motor turns the gears in the correct direction. Also note the motor may be installed in either side of the base, depending on which way you want your model to face and whether or not you want to see the motor.Thanks again!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    Excellent work, congratulations!Greg

    Can't seem to view the video. :(Greg

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  • gzumwalt commented on gzumwalt's instructable Heltech WiFi Kit 32 Based Network Scanner3 months ago
    Heltech WiFi Kit 32 Based Network Scanner

    Thank you very much, I'm truly glad you enjoyed these!I've designed other Heltec based projects, and may publish them soon.Thanks again!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    Hi Rolland,I've uploaded the Autodesk Fusion 360 "Flower.f3d" file which is the design file for the flower.Hope this helps!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    Just uploaded what I believe to be the correct "Axle Gear Compound 60, 20.stl".Sorry again, and hope I got it right this time.Greg

    Just uploaded what I believe to be the correct "Axle Gear Compound 60, 20.stl".Sorry again, and hope I got it right this time.Greg

    Just uploaded what I believe to be the correct "Axle Gear Compound 60, 20.stl".Sorry again, and hope I got it right this time.Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird3 months ago
    Hummingbird

    I’m truly sorry about this. Unfortunately, I’m out of the country right now but I’ll fix this when I return in a few days. Again I’m truly sorry. Greg

    I’m truly sorry about this. Unfortunately, I’m out of the country right now but I’ll fix this when I return in a few days. Again I’m truly sorry. Greg

    I’m truly sorry about this. Unfortunately, I’m out of the country right now but I’ll fix this when I return in a few days. Again I’m truly sorry. Greg

    Thank you so very much, I’m glad you enjoyed it!It was indeed frustratingly complicated the first time. The second attempt finally performed as I had desired, but it too required some “tuning”. :)Thanks again!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird4 months ago
    Hummingbird

    Hi EshRobotics,First, well, I'm old and have seen a lot of things, taken a lot of pictures and made a lot of notes over the years.However, I recommend websites that show gears and automata. For example, if you use Autodesk Fusion 360, then search for "Fusion 360 gears" and watch the videos. Also search for "mechanisms", "automata mechanisms", "wooden mechanisms" or the like and you'll find a lot of images, videos and "how to's".Best of luck!Greg

    This worked very well for me: https://www.instructables.com/id/Hummingbird-25mm-Motor-Adapter/. It is much easier to create an adapter than it is to modify the base. If it doesn’t work for you, let me know and I will post the base design. Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird4 months ago
    Hummingbird

    I’m sincerely sorry for the difficulties you’ve experienced with this model. Could you please provide the version number of the Cura slicer you are using and your printer model?I used Cura 3.2.1 and printed on an Ultimaker 2+ Extended and an Ultimaker 3 Extended. Again, I am trying sorry for the difficulties you’re experiencing.Greg

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  • gzumwalt's instructable Hummingbird's weekly stats: 4 months ago
    • Hummingbird
      10,100 views
      130 favorites
      45 comments
  • gzumwalt commented on gzumwalt's instructable Hummingbird4 months ago
    Hummingbird

    Thank you very much!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird4 months ago
    Hummingbird

    thank you very much, I’m glad you liked it!Yes, I did animate the gears and joints, mostly to check my math to make sure the body didn’t exceed the calculated limits and run into he base gears. However, I never was able to figure out how to model the wing pivot, so I built a small test version. Thanks again!Greg

    Thank you very much!Check this out:https://www.instructables.com/id/Hummingbird-25mm-Motor-Adapter/

    Thank you so very much, I’m glad you liked it!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird4 months ago
    Hummingbird

    Thank you, and thanks for your vote!Greg

    Thank you very much! It did take awhile, but the wife smiles when she sees it and that and comments such as yours make it all worthwhile.Greg

    Thank you very much for your kind words, I am truly happy that you enjoyed it!Greg

    Hi bgerens,Depending on your printer type, settings, colors, etc., ABS may work quite well.Believe it or not, the design process for this model started with "Wheel Body.stl" and "Rod Connecting 6.3mm Hole.stl" which are perhaps the most difficult of the Hummingbird parts to print. The ball on the wheel is 6mm, and the hole in the connecting rod is 6.3mm. Try printing these parts first to see how well they fit, and if they do, you should be good to go!The attached photo shows I performed this fit test of the wheel and connecting rod on a test base, to test the geometry and fit of these components. This test was how this design got its start, quite awhile ago!Greg

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  • gzumwalt commented on gzumwalt's instructable Hummingbird4 months ago
    Hummingbird

    Thank you so very much! It was indeed a labor of love to complete it for my wife, and she smiled, a lot.

    The motor I used in the original design (as described in the instructions) slides into either of the 16.20 mm holes located on either side of the base (I forgot to mention in the Instructable that the motor can be mounted on either side of the base, depending on which direction you will be placing your Hummingbird).A month after completing this design, I decided to change to this motor, 30RPM DC 6v .1A 25mm Diameter Gear Box Speed Reducer Motor (still available on e-bay), that I had in my "box of motors" box. This motor is much quieter at the expense of increased size, so I made this 25mm adapter and gear such that it presses into the 16.2mm holes in the base, and has an extended gear. I worked quite well, and saved me from having to re-print the base.

    You are very welcome, and I am pleased this model made your day!

    Thank you very, very much! It makes me happy when my design puts a smile on a face!

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