Product teardowns are great, but getting an unfiltered one from the people who actually designed and built the product is a rare treat. In the lengthy video after the break, former Formlabs engineer [Shane Wighton] tears down the Form 4 SLA printer while [Alec Rudd], the engineering lead for the project, answers all his prying questions.

[Shane] was part of the team that brought all Form 4’s predecessors to life, so he’s intimately familiar with the challenges of developing such a complex product. This means he can spot the small design details that most people would miss, and dive into the story behind each one. These include the hinges and poka-yoke (error-proofing) designed into the lid, the leveling features in the build-plate mount, the complex prototyping challenges behind the LCD panel and backlight, and the mounting features incorporated into every component.

A considerable portion of the engineering effort went into mitigating all the ways things could go wrong in production, shipping, and operation. The fact that most of the parts on the Form 4 are user-replaceable makes this even harder. It’s apparent that both engineers speak from a deep well of hard-earned experience, and it’s well worth the watch if you dream of bringing a physical product to market.

You probably know [Shane] from his YouTube channel Stuff Made Here. We’ve covered many of his ludicrously challenging projects, like the auto-aiming pool cue and golf club, a robotic hairdresser, and an “unpickable” lock.

What does it take to make decent tires for your projects? According to this 3D printed tire torture test, it’s actually pretty easy — it’s more a question of how well they work when you’re done.

For the test, [Excessive Overkill] made four different sets of shoes for his RC test vehicle. First up was a plain PLA wheel with a knobby tread, followed by an exact copy printed in ABS which he intended to coat with Flex Seal — yes, that Flex Seal. The idea here was to see how well the spray-on rubber compound would improve the performance of the wheel; ABS was used in the hopes that the Flex Seal solvents would partially dissolve the plastic and form a better bond. The next test subjects were a PLA wheel with a separately printed TPU tire, and a urethane tire molded directly to a PLA rim. That last one required a pretty complicated five-piece mold and some specialized urethane resin, but the results looked fantastic.

Non-destructive tests on the tires included an assessment of static friction by measuring the torque needed to start the tire rolling against a rough surface, plus a dynamic friction test using the same setup but measuring torque against increasing motor speed. [Overkill] threw in a destructive test, too, with the test specimens grinding against a concrete block at a constant speed to see how long the tire lasted. Finally, there was a road test, with a full set of each tire mounted to an RC car and subjected to timed laps along a course with mixed surfaces.

Results were mixed, and we won’t spoil the surprise, but suffice it to say that molding your own tires might not be worth the effort, and that Flex Seal is as disappointing as any other infomercial product. We’ve seen other printed tires before, but hats off to [Excessive Overkill] for diving into the data.

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