No Malice, Still Sacked: What This 3D-Printed Gun Case Teaches Employers About Valid Reason

A teacher spent 22 years building a solid reputation in the classroom. Then she spent one weekend on a 3D printer, and it cost her the job.

The Fair Work Commission has just knocked back an unfair dismissal claim from a Canberra high school teacher who printed a replica handgun at home and brought it into school to show students what the technology could do. No malice. No intent to scare anyone. Just, in the Commission’s words, an astonishing lack of judgement.

This one is worth a read for every employer, because it’s a masterclass in a question we get asked constantly: does intent matter when you’re deciding whether to dismiss someone?

What happened

The teacher, a digital technology and maths teacher in her mid-50s, wanted to get students excited about 3D printing as a subject elective. Over a weekend in April 2025, she printed a replica firearm using plans she’d downloaded, complete with moving parts.

On the Monday, she proudly showed it to an executive teacher, and even demonstrated racking the slide back like she was preparing to fire it. The executive teacher’s response was blunt: put it away, you can’t show that to students.

Other staff who saw the replica reacted very differently to her. Several instantly clocked the risk. One later said it “didn’t sit right” and spent the whole day thinking about it. That gap in reaction, calm confidence from her, alarm from everyone else, became a key part of the Commission’s reasoning.

Police were called, her home was searched, the printer and firearm were seized, and she was formally cautioned (creating or printing a firearm is illegal in the ACT). The school stood her down while police and the ACT Public Sector Standards Commissioner investigated, then terminated her employment for serious misconduct.

Her case for unfair dismissal

She argued the sacking was harsh and disproportionate. One isolated incident, no ill intent, 22 years of otherwise clean service. She wanted her job back, or at worst a written warning, some retraining, or a transfer to a different school.

It’s a sympathetic set of facts. And the Commission agreed with parts of it.

Why she still lost

This is the bit every employer should sit with. Commissioner Sarah McKinnon explicitly accepted there was no malice, and that the emotional and financial fallout made repeat behaviour unlikely. She noted the teacher had cooperated fully with the investigation and shown genuine remorse.

None of that saved her.

The Commission found a valid reason for dismissal and a fair process, full stop. Replica firearms are banned because they look real, and schools now train staff in lockdown procedures because of the risk of school shootings. Showing a working-looking replica to teenagers carried real risk, including the risk of copycat behaviour or students hunting down the same plans online. Good intentions didn’t neutralise that risk.

The line that sums it up: printing a replica firearm and bringing it to school without realising that was a bad idea “were not simply misguided. They showed an astonishing lack of judgement for such an experienced teacher.”

The lesson for employers

Unfair dismissal claims often get run, and won, on process. Get the process wrong and even legitimate misconduct can turn into a payout. But this case is a reminder that when the conduct itself is serious enough, sympathy, service length and good intentions won’t rescue the employee, provided you’ve followed a fair process to get there.

For business owners, that cuts both ways:

• A valid reason doesn’t require malice. Serious lapses in judgement can meet the bar on their own, especially where there’s a genuine safety or legal risk attached.
• Long service isn’t a free pass. It can matter to compensation in a successful claim, but it doesn’t override a valid reason for dismissal.
• Process still has to be fair. The Commission looked closely at how the investigation was run and how the decision was made. That’s what protected the employer here just as much as the seriousness of the conduct did.
• “They didn’t mean any harm” is not a defence on its own. If you’re weighing up a serious misconduct matter and leaning on intent to talk yourself out of acting, that’s exactly the moment to get advice.

If you’re sitting on a misconduct issue right now and you’re not sure whether it clears the bar for dismissal, don’t guess. Get it wrong on either side, too soft or too harsh, and it gets expensive.

FAQs

Does an employee need to have bad intentions for a dismissal to be valid?

No. The Fair Work Commission can find a valid reason for dismissal based on serious misconduct or a serious lapse in judgement, even where there was no malicious intent involved.

Does long service protect an employee from dismissal?

Not on its own. Length of service can be a factor the Commission weighs when assessing whether a dismissal was harsh, but it doesn’t override a valid reason for termination.

What makes a dismissal process fair in the eyes of the Fair Work Commission?

Broadly, the employee needs to know the allegations against them, have a genuine chance to respond, and have the decision made without bias. Following a clear, documented process matters as much as the conduct itself.

Can showing remorse or cooperating with an investigation stop someone being dismissed?

It can influence findings around compensation if a dismissal is found unfair, but it doesn’t automatically prevent a valid dismissal for serious misconduct.

Bottomline

Serious misconduct calls are some of the hardest ones to get right, and the ones with the most riding on them. If you’re facing a call like this, HR Gurus can help you cut through the BS and get it right the first time. Book a chat with the team.