Round to Square Movement Tray Adapters

Keep your models on their round bases and rank them up as a square-based unit. No rebasing.

Open Basing System (OBS) by Hobby Heaven · 250 size and layout options · from £2.49

Why use an adapter tray

• No rebasing. Painted and based models stay exactly as they are. Nothing to cut off, nothing to redo.
• Ranks up as square bases. The outer footprint is a grid of the square size you pick, so the unit takes up the space of square-based models.
• Removable. The round base sits loose in its pocket. Lift the model out and use it on round bases again whenever you like.
• One tray moves the whole unit. It works as a movement tray, from a single model (1x1) up to 60 models (10x6).
• Paintable. Black PLA as standard; paint or texture the rim to match your basing.

How to choose yours in 3 steps

In the drop-down menu each option reads like this: 25->25mm Round to Square 5x4 (5 bases x 4 Lines). The first number is your round base, the second is the square size, then the layout. Every variation has its own technical-drawing photo with the exact outer dimensions.

Size guide: the full range

Not every combination exists in every series. The drop-down menu shows exactly which layouts are available for each size. The single-model 1x1 is available for 20mm round bases only.

New in this update: the full 20mm series (to 20mm and 25mm square), wide and deep layouts up to 10x6 for 25mm, up to 9x6 for 25->30, 28->30 and 32->32mm, up to 7x6 for 40mm and up to 5x5 for 50mm.

How big is the tray?

Each tray has a 2mm rim on every side. To work out the outer size:

Length = bases per line x square size + 4mm
Width = lines x square size + 4mm

• 5x4 at 25mm square = 129 x 104mm
• 7x6 at 32mm square = 228 x 196mm

The exact dimensions for your variation are on its technical-drawing photo.

How it works

The tray has one round pocket per model. Each pocket is cut slightly larger than the round base, so the base drops in without forcing. Around the pockets, the tray's outer edge is laid out as a grid of the square size you chose, so on the table the unit occupies the footprint of square-based models.

Your model never leaves its own round base. Put it in the pocket to play a square-based game; take it out to play a round-based one.

Specifications

What you get

1 x adapter tray in the size and layout you select. Models and bases are not included.

Who it is for

• Players crossing over: armies built on round bases that you want to field in rank-and-flank fantasy or historical games played on square bases.
• Collectors: painted, finished models you would rather not risk rebasing.
• OBS users: made for 20, 25, 28, 32, 40 and 50mm round bases, including our own OBS round bases.

Hobbyist tips

• Want the bases held in place? Use a small dab of our Flexi Putty (reusable adhesive putty, Hobby Heaven HHP range, in our store). It holds the base for play and still lets you lift the model out. Please don't use superglue or epoxy: the tray is meant to stay removable.
• Paint the rim to match. A coat in your basing colour, or a little texture on the rim, makes the tray blend in with the unit.
• Check the drawing before you order. Each variation's technical-drawing photo shows the outer size, handy if you need the tray to fit a case or a frontage.
• Buy the whole army at once. Multi-buy discount and a single postage charge per order make a full set of trays cheaper per tray.

Good to know

• These are FDM 3D prints, so fine print lines can be visible close up. Paint hides them.
• Pockets are sized for the round base stated on each variation. Bases from other makers can differ slightly, so measure yours first.
• The tray changes the footprint, not the model. Wide poses can still touch their neighbours in a tight square rank.
• Basing rules differ between games and events. Check with your opponent or organiser that an adapter tray is fine for them.
• Each tray is made to order, so allow up to 3 working days before dispatch.

Multi-buy discount

The discount is applied by eBay at checkout.

Postage and returns

• Royal Mail Large Letter, £2.60 per order. Every extra item in the same order ships for £0.00, so you pay postage once.
• Dispatch within 3 working days. Trays are made to order.
• 30-day returns. See the returns section of this listing for details.

Not sure which one you need?

Send us a message with your round base size, the square size you are after and how many models are in the unit, and we will point you to the right variation. Missing a size or layout? Tell us. Requests from players shape what we add to the Open Basing System next.

Hobby Heaven · By Hobbyists. For Hobbyists.

The Open Basing System (OBS) is our range of bases, converters, movement trays and adapters designed to work together, so you choose the base size and keep the freedom to change it later.