Modern models often come on oval bases — great for dynamic poses, but awkward when you want to rank a unit up, move it as one block, or display it in tidy formation. These adapters drop your oval-based models straight into a snug rectangular tray, so a whole unit moves, measures and stores as one clean block. Your models stay exactly where they are — nothing to unglue, nothing to repaint.

A Bridge to Classic Rank-and-File Gaming

With the revival of traditional, rank-and-file wargaming — the kind built around square and rectangular bases and tightly-ranked regiments — these adapters earn a second job: they let your oval-based models fall in and fight in ranks.

If your collection sits on modern ovals but the game on the table calls for tidy square-and-rectangle blocks, these trays are the bridge between the two systems. Rank your models into neat regiments, wheel and move them as one, and get that classic ranked-up look — no rebasing required.

See the note below on sizing — the outer footprint is a bespoke size, so check the technical drawing to confirm frontage for your game.

⚠ PLEASE READ — ABOUT THE RECTANGLE SIZE

These adapters are built around our oval base range, so the outer rectangular footprint is a bespoke size — not an off-the-shelf “standard” rectangle base size. A standard rectangle simply doesn’t wrap an oval cleanly, so we add a small margin (approx. 2 mm) around the oval so your models sit securely with a snug, wobble-free fit.

Exact outer dimensions therefore vary by variant. Every variant includes a technical drawing with the precise measurements — please check the drawing for the size you need before you order.

How It Works

01 Choose your oval base size (e.g. 60×35mm, 90×52mm).

02 Choose your formation — single, ranks, or lance.

03 Drop your models in — done. Lift any base out any time for painting or storage.

Oval Base Sizes Supported

    60×35mm  ●  75×42mm  ●  90×52mm  ●  105×70mm
120×92mm  ●  150×95mm  ●  170×105mm
  

These are the oval base sizes each slot accepts. The resulting rectangle footprint is shown on the technical drawing for each variant.

Formation Options

Single & Ranks	1×1 up to 6×3 (depending on base size)
Lance	Lance 3 & Lance 6 — wedge formation for cavalry-style charges

Not every formation exists in every size — larger ovals come in fewer layouts. Use the variant selector to see what’s available.

Why You’ll Like Them

◆ Snug, wobble-free fit — the 2mm-margin design holds oval bases securely.

◆ Easy base removal — lift models out for painting, transport or storage.

◆ Paint-ready surface — takes primer, paint and texture if you want to finish the tray.

◆ Durable 3D-printed plastic — light, tough and warp-resistant.

◆ 100% OBS compatible — part of our Open Basing System ecosystem.

Specifications

Type	Movement Tray Adapter (Oval to Rectangle)
Input Base Shape	Oval
Output Footprint	Rectangle — bespoke size, see drawing
Material	3D Printed Plastic (PETG/PLA, FDM)
Colour	Black (paintable)
Miniature Scale	28–32mm
Top Edge	Flush with base edge
Production Time	Made to order (up to 3 business days)
OBS Compatible	Yes (Open Basing System)
Country of Origin	United Kingdom (printed in Derby)
HS Code	39269097
Brand	Hobby Heaven

Frequently Asked Questions

Do I have to rebase my models?

No. Your models stay on their existing oval bases. You simply drop each base into the adapter tray — no gluing, no cutting, no repainting.

Are the rectangle sizes standard?

No — and this is important. The rectangular footprint is built around the oval base plus roughly a 2mm margin, so it is a bespoke size rather than an off-the-shelf standard rectangle base. Always check the technical drawing on the variant you want for exact outer dimensions.

Can I use these for traditional rank-and-file games?

Yes — they’re a popular way to field oval-based models in square-and-rectangle, rank-and-file wargaming. Because the footprint is bespoke, check the technical drawing against your game’s expected frontage before buying.

Which oval base size do I choose?

Choose the size that matches the oval bases your models are already on — for example a 60×35mm oval slot for models on 60×35mm ovals. Then pick the formation (single, ranks, or lance) for how many models you want per tray.

What are they made from?

Durable FDM 3D-printed plastic (PETG/PLA), printed to order in our Derby workshop. The surface is paint-ready if you’d like to finish the tray to match your basing.

Hobby Heaven — By Hobbyists. For Hobbyists.

Part of the Open Basing System (OBS) — an open, modular basing ecosystem where bases, converters, movement trays and adapters all work together.

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Bases Trays And Converters - Items tagged as "Oval to rectangle"

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