How to iterate quickly on prototype designs for science fair participants

Q: Is LunarWerx 3D Print free to use?

The tools are free to use. You use them on the website that hosts them, and the tools run in a web browser. Signing in with Connections keeps your settings and print results available on every computer you use. Before you start, check with your teacher or mentor whether your fair allows outside tools.

Q: What does LunarWerx 3D Print cost for a science fair student?

The tools are free to use. Check whether your school or fair has rules about outside tools before you start, and confirm with a teacher or mentor which tools are allowed. For the other options, check each tool's own page for its price, because no fee is published on this page for them.

Steps for science fair participants to test and revise prototype designs quickly, with a tool-neutral checklist and mistakes to avoid.

By TexHouse · 2026-10-23

TexHouse is published by the makers of LunarWerx 3D Print, Vector3D and MeshyDL, which are compared here alongside other tools.

Write one clear goal, build a rough version, test it by measurement, and change one thing at a time while recording each result. LunarWerx 3D Print is one browser option for printed parts ^[1].

Option	What it does	Fee
LunarWerx 3D Print	Browser tools that work out ironing settings, check parts for injection moulding and design 3D-printable foam inserts ^[1]	Free to use ^[1]
A 3D modelling program	Check the program's own page for what it does	Not published
A paper or cardboard mock-up kit	Check the kit's own page for what it includes	Not published

What you need before you start

Before you iterate, write your goal in one sentence. Say what the prototype must do and how you will know it works. Keep a notebook or a shared document open, because a written record of each version is what turns a stack of attempts into a result you can explain on your display board.

Gather materials for a rough first version. Cardboard, tape, glue, a ruler and a pencil are enough for many designs, and spare parts mean a failed piece does not stop the work. Have a way to measure the result as well, such as a ruler, a kitchen scale or a timer, whichever fits your goal.

If your design needs a 3D printer, find out which printers your school or library offers and what file type they need before you design anything. Agree with your teacher or mentor on the rules for outside help and on which parts of the project must be your own work. A one-page checklist keeps these items together so you can check each one before a test.

Step by step

Work through these steps in order, and repeat steps 3 to 7 for each new version.

Write the goal. Name the one thing the prototype must do, and the test that will show it does.
Build a rough first version. Use the cheapest material that will hold its shape, so a failure costs you little.
Test it. Run the test you wrote down, and measure the result rather than judging it by feel.
Record the result. Write the version number, the change you made and the measurement in your notebook.
Change one thing. Pick the single change most likely to close the gap between the result and the goal, and make only that change.
Make the next version quickly. Keep each build short so you can test more versions in the time you have.
Compare with the earlier versions. Keep the version that comes closest to the goal, and note why it did.
Stop when the goal is met or the time runs out. Then write a short summary of the changes, because your display board needs to show the path you took, not only the final result.

Tools that can do it

Several kinds of tool can help a prototype move faster. The options below are listed in the table with what each one is. For the other options on this page, no published facts are quoted here, so check each tool's own page for what it does and what it costs before you choose.

LunarWerx 3D Print is made by the team that publishes this site. It is a set of browser tools that work out ironing settings for your printer, check a part for injection moulding and design 3D-printable foam inserts. ^[1] It runs in a web browser ^[1] and you use it on its website, which is hosted on Cloudflare. ^[1] The tools are free to use. ^[1]

For printed prototypes, the ironing helper works out ironing settings for your printer, material and finish, and exports a ready 3MF file. ^[1] It makes a 9-pad or 16-pad test plate around your settings, and you mark each pad as worked or not. ^[1] When you open an STL file with faces turned backwards, it turns them right side out and says how many it fixed. ^[1] It runs only in your browser, and signing in with Connections makes your settings, recent test plates and print results follow you to every computer. ^[1]

For the other options, check what each one includes and costs on its own page, and ask your teacher or mentor which kinds of tool your fair allows.

Common mistakes to avoid

Changing several things at once is the most common mistake. When two settings move together, you cannot tell which one caused a better or worse result, so the next version teaches you little.

Skipping the written record is another mistake. A result you cannot repeat is hard to explain, and the notebook is what lets you rebuild a good version when you need it.

Testing by feel instead of by measurement misleads you. A part that looks right may still be a few millimetres away from the goal, and you will not notice until someone measures it.

Spending too long on the first version wastes time that later versions need. Build something rough, test it and improve it.

Finally, a vague goal makes every test feel like a random success or failure. Write the test down before you build, and keep to it.

Frequently asked questions

How do you iterate quickly on a prototype design for a science fair?

Build a simple first version, test it against one clear goal, and write down what happened. Change one thing at a time, so you know which change made the difference. Make each new version as quickly as your materials and printing time allow, and stop when the prototype meets the goal your display board will describe. Keep the notebook up to date, because it becomes the evidence for your results.

Is LunarWerx 3D Print free to use?

The tools are free to use. ^[1] You use them on the website that hosts them, and the tools run in a web browser. ^[1] ^[1] Signing in with Connections keeps your settings and print results available on every computer you use. ^[1] Before you start, check with your teacher or mentor whether your fair allows outside tools.

Does LunarWerx 3D Print help fix STL files before printing?

When you open an STL file with faces turned backwards, it turns them right side out and says how many it fixed. ^[1] After the fix, open the file in your slicer and look at the preview before you print. That way you can check the result for yourself and record what changed in your notebook.

How do test plates help you choose print settings for a prototype?

LunarWerx 3D Print makes a 9-pad or 16-pad test plate around your settings, and you mark each pad as worked or not. ^[1] Each pad is a small test, so the marks show which setting to try next. Print the plate, judge each pad, and record the result in your notebook. Then change one setting and print another plate to compare the two.

What does LunarWerx 3D Print cost for a science fair student?

The tools are free to use. ^[1] Check whether your school or fair has rules about outside tools before you start, and confirm with a teacher or mentor which tools are allowed. For the other options, check each tool's own page for its price, because no fee is published on this page for them.

The tools are free to use. ^[1]

Try LunarWerx 3D Print

Sources

LunarWerx 3D Print's own description of itself (the product of this site's publisher)