The world of 3D printing, as well as marketing of items and products, currently still has a great deal of latitude on virtually every level because it is still such a new industry. From issues like copyrighting and legalities, to honesty in advertising versus reality, there is the usual gamut of concerns ready to emerge in one big buzzkill. Along with these issues that accompany a novel technology steadily going mainstream comes the matter of testing products. How does a normal person test their own—or another—3D printed product, accurately?
Michael Graham (MechEngineerMike), of Engineer Dog, sharing his Instructables project for TestrBot, has not only designed a tester for 3D printed products and materials, but he’s 3D printed nearly the entire TestrBot machine, which is of course, self-replicating. So, time to get testy and get your friends going with their own TestrBots too, after you print them off the materials to make their own.
“3D printing is still new enough that there are many questions that do not yet have definitive answers,” says Michael. “While the basic physical properties of raw ABS & PLA have been well established, there are still many esoteric material properties that cannot be determined without doing actual mechanical testing.”
Assembled with all 3D printed parts except for some parts found at your common hardware store, as well as some that were ordered online, the TestrBot is a $300 machine that can be used to test 3D printed parts up to 200 lbs., whether for tension or compression.
“It was designed to allow me to run a gambit of physical tests on 3D printed specimens,” stated Michael.
While testing for force and displacement, Michael emphasizes how much can be discovered in those processes. Measuring displacement at distance increments of .00014” or about 1/28th the thickness of a sheet of paper, its readings for force are slightly more limited. The TestrBot can measure as small a force as .195 lbs.
The testing equipment has been tested itself and proves to be extremely reliable, which you can discover yourself by testing something more than once. With 50 parts total, Michael created an Excel file, which you can download in the Instructable for clear instruction.
- 3D printer
- Miter saw or tool for cutting straight edges
- Drill press or tool for drilling straight holes
- Electronics soldering equipment
- Purple PVC primer & ABS transition cement
- Digital level for aligning the cross heads
With the 50 parts you will want to take a look at from the Excel file, you will need to assemble the TestrBot for the following major areas of the machine:
Frame – Made of all wood and steel, all of the parts can be purchased at your hardware store. Michael built a prototype frame also, that you can take a look at on Thingiverse.
While it’s crucial to make sure all holes are drilled squarely, Michael points out that you’ll need to employ sandwiching, a beam design technique which requires you to glue two steel sheets on either side of a lightweight printed core. If you are not comfortable with the labor intensive aspects of that process, he suggests using a wooden 2×4.
Test Fixturer – Pointing out that assembly of the test fixture is extremely easy, Michael does explain that he used the the four point bend, as he finds it to be a great method for testing 3D prints due to its realistic loading method, simple design, sensitivity, and its facility in exposing flaws and defects.
Actuator – Picking a stroke of 5.375”, you can choose any that you like. Below are the equations to determine actuator component lengths for a given stroke:
Stroke = Your choice
Small PVC pipe length = stroke + 3.125”
Large PVC pipe length = stroke + 1.625”
Anti-Rotation Rod length = stroke + 2.625”
Threaded Rod length = stroke + 4”
Controls – This is where the more complex part of assembly is required. While 3D printing the case should be simple and you can download the files, soldering the protoboard may be time consuming. Check out the circuit diagrams in the Instructable for greater ease.
Once everything is assembled and you are ready to use your TestrBot, check the display screen for the following:
- Current load
- Status of the actuator
You may want to connect the TestrBot to your PC as Michael suggests, using it to read data and generate professional-looking Excel graphs upon analysis of 3D printed parts—or anything else for that matter, as you will find that this machine is good for testing many other items as well.
Is this a design you are interested in 3D printing? What are you interested in testing? Share with us in the TestrBot forum over at 3DPB.com.
Subscribe to Our Email Newsletter
Stay up-to-date on all the latest news from the 3D printing industry and receive information and offers from third party vendors.
You May Also Like
3D Printing Financials: Xometry’s Year of Growth and Challenges
Finishing 2023 amid broader economic challenges that have troubled many in the 3D printing sector, Xometry (Nasdaq: XMTR) reported a solid 31% increase in the fourth quarter revenue, reaching $128...
3D Printing Financials: 3D Systems Misses Revenues by 9.32%, Targets 2027 for Clinical Human Lung Trials
In the latest financial unveiling, 3D Systems (NYSE: DDD) shared its fiscal report for the last quarter of 2023 and the entire year, shedding light on its struggles and strategic...
3D Printing Webinar and Event Roundup: February 25, 2024
It’s another busy week of webinars and events in the AM industry, including Silicone Expo Europe in Amsterdam, an open house for Massivit in North America, and the AM for...
Materialise Expands Jaw Surgeries with End-to-End Medical 3D Printing Treatment
Imagine the discomfort of experiencing pain every time you eat, or the constant radiating pain in your head due to this condition—it would be incredibly distressing. One reason why joint...
Upload your 3D Models and get them printed quickly and efficiently.