3D printed sandbag armor for a 1/35 M5A1 Stuart

Oct 11, 2026 Last reply: 3 hours ago 4 Replies
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When everything comes together, this build reads as a wartime M5A1 Stuart with sandbags piled on the front hull, held by thin wire and a small metal rack, just like in the old photograph that inspired it. The maker took that single historical image and turned it into a printable part that looks natural at 1/35 scale, adapted to fit the AFV Club M5A1 kit. The finished tank wears olive drab with dried mud on the tracks and lower hull, rust on the metal parts, and white painted markings up front.



The way it was made stands out to me. The whole sandbag assembly was first modelled in 3D, with Blender handling the overall geometry and Zbrush used for details like the thin ropes. Blender's physics tools helped get a natural sense of gravity and weight in how the bags slump and stack, and that approach also allowed adjustments, test prints and restarts when needed. The parts were then separated for resin printing and test-fitted on the model before any paint went on.



The finishing looks thought through. The bags got extra volume so they could be painted at scale, then acrylics, a glossy varnish and an oil pinwash, with the fabric lines picked out in a lighter tone afterwards and a final matt varnish to keep off any shiny spots. Weathering drew on late war pictures of tanks in Germany plus other scale model photos for the bags themselves.



One trade-off worth noting: the printed result had to be adjusted to fit around the photo-etched lightguards, and the maker would like to try the parts on a fresh kit with the stock lightguards. There is also honest doubt about accuracy, since old photographs simply lack detail. The STL is already out there, and physical prints may follow soon.


I would love to know how the physics step worked in practice. Did the maker let the bags settle onto a rough hull shape and then clean up the result, or was the pile positioned by hand afterwards before the parts were split for resin printing?

Giving the sandbags extra volume before printing seems like a clever call. At 1/35 there is barely any surface to catch paint, so the added bulk gives the acrylics, pinwash and lighter fabric lines something to sit on. The trade-off is that the bags may read slightly larger than the reference, but on a subject this under-documented that seems a fair price.

Since the maker wants to try the parts on a new kit with the stock lightguards, it might be worth printing a second set with slightly flattened backs on the lower bags. That could ease the fit around the photo-etched lightguards on this first version too, and the thin rope details would still carry the realism.

On the front bumper question: the maker has said the front hull plate came from online, and the sandbags were the only part of this build that was their own work. So that piece was not modelled by the maker, the printed set was shaped to sit on the existing kit front.

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