An ABS drone shell is a packaging problem in the engineering sense: it protects the electronics, carries the motors and has to weigh almost nothing. Vacuum forming delivers that combination more cheaply than any other process at low volume.
A survey drone maker in Bristol formed 400 shells a year from 2 mm ABS. The returns were almost all the same: hairline cracks radiating from the motor mount screws after 30 to 50 flight hours.
ABS drone shell gauge and forming
- Small multirotor: 1.5 mm, shell weight around 90 g
- Survey and inspection airframe: 2 mm
- Heavy lift or structural shell: 2.5 to 3 mm
- Arm root wall after forming: keep above 1.2 mm
Forming thins the wall where it matters most. A 2 mm sheet drawn over a 40 mm arm radius lands at about 1.4 mm, and the motor screws then sit in a 1.4 mm wall carrying vibration. The fix is a formed rib or a bonded doubler, not a thicker starting sheet everywhere.
Vibration, doublers and paint
Vibration is the real load, not impact. A multirotor transmits high-frequency vibration through the arm into the shell, and any stress concentration becomes a crack. Bonded doublers at the motor mounts, or moulded-in inserts, spread that load across 30 mm instead of 6 mm.
Paint adhesion on ABS is reliable if the surface is prepared. A light scuff, an IPA wipe and an adhesion promoter give a finish that survives handling; painting straight onto a mould-release surface does not.
UV is the outdoor limit. ABS chalk and yellows in strong sun, which matters for a white shell used daily. A UV-stabilised grade or a painted finish buys years, and the ABS wholesale guide covers the standard grades and colours.
Cutting the shell open for access is a routing job; the settings that avoid a melted edge are in the ABS cut-to-size guide, and where the same material is used for a case, see ABS sheet for tool cases.
Send your shell drawing, motor layout and drop requirement to oversales@rpplexiglass.com for a forming quotation.
Frequently Asked Questions
What thickness ABS for a drone shell?
1.5 mm to 2 mm for a small multirotor shell, 2.5 mm to 3 mm for larger airframes or where the shell is structural. Thickness at the arm root after forming is what matters, not the starting gauge.
Why do ABS drone shells crack at the motor mounts?
Vibration plus a hard fixing through a thinned wall. The formed shell at the arm root may be 1.2 mm from a 2 mm start. A bonded doubler or an insert spreads the load and stops the crack.
Is ABS good for outdoor drones?
It handles impact and temperature well but degrades in UV. An outdoor airframe needs a painted or UV-stabilised grade, or a shell that is replaced on a schedule rather than expected to last indefinitely.