PRODUCT DESCRIPTION

Square to Rectangle Base Converters – Warhammer The Old World | OBS Compatible | 3D Printed

🏆 Square to Rectangle Base Converters 🏆

Premium 3D Printed | Tabletop Games Compatible | Made in the UK

⚔️ Part of the Hobby Heaven OBS – Open Basing System ⚔️

💡 NO REBASING REQUIRED! Your models stay on their original bases. 💡

🔄 What Are Square to Rectangle Base Converters?

These precision 3D printed adapters let you place any square-based miniature onto a rectangle base instantly — with no glue, no damage, and no permanent changes. Perfect for players transitioning their square-based armies to Warhammer: The Old World, Kings of War, or any other rank-and-flank system that uses rectangular bases.

🎮 Why Do You Need These Converters?

❌ The Challenge

Many classic Warhammer Fantasy armies were built on square bases. With games like The Old World requiring rectangle bases for cavalry, chariots, and monsters, players face a difficult choice: rebase everything (costly and risky) or simply stop using beloved painted models. Neither option is acceptable.

✅ Our Solution

Drop your square-based model into the converter. It sits perfectly, holds firmly, and is fully reversible. Switch back to your old game in seconds. Your miniatures are never touched, never damaged, never glued.

🔧 How It Works — 3 Simple Steps

📦

Step 1 — Choose Your Size

Select the converter matching your model's current square base size and your target rectangle output.

🔄

Step 2 — Place Your Model

Simply place the square-based model into the converter. No tools, no glue, no hassle.

⚔️

Step 3 — Game On!

Use your models on rectangle bases. Optionally paint the converter to match your basing style.

📏 Complete Size Guide

Input Square Base	Output Rectangle Base	Typical Use in TOW / Rank & Flank	Available Pack Sizes
20mm Square	50×25mm Rectangle	Light cavalry, skirmish riders, wolf riders	×1, ×3, ×5, ×10, ×25
20mm Square	60×30mm Rectangle	Standard cavalry mounts, mounted heroes	×1, ×3, ×5, ×10, ×25
20mm Square	60×40mm Rectangle	Heavy cavalry, armoured horses	×1, ×3
25mm Square	50×25mm Rectangle	Light cavalry, fast riders	×1, ×3, ×5, ×10, ×25
25mm Square	60×30mm Rectangle	Standard cavalry, knights	×1, ×3, ×5, ×10, ×25
25mm Square	60×40mm Rectangle	Heavy cavalry, barded mounts	×1, ×3
30mm Square	60×30mm Rectangle	Cavalry characters, command models	×1, ×3, ×5, ×10, ×25
30mm Square	60×40mm Rectangle	Ogre cavalry, large mounts	×1, ×3
30mm Square	75×50mm Rectangle	Monstrous cavalry, war beasts	×1, ×3
40mm Square	60×40mm Rectangle	Elite cavalry, fully armoured knights	×1, ×3, ×5
40mm Square	75×50mm Rectangle	Monstrous cavalry, dragon riders	×1, ×3, ×5
40mm Square	100×50mm Rectangle	Chariots, war machines with crew	×1, ×3, ×5
40mm Square	100×60mm Rectangle	Large chariots, heavy war machines	×1, ×3, ×5
50mm Square	75×50mm Rectangle	Large cavalry mounts, wyvern riders	×1, ×3, ×5
50mm Square	100×50mm Rectangle	Chariots, siege weapon bases	×1, ×3, ×5
50mm Square	100×60mm Rectangle	Large monsters on chariot-style bases	×1, ×3, ×5
50mm Square	150×100mm Rectangle	Massive monsters, titans, centrepiece models	×1
100mm Square	150×100mm Rectangle	Giants, large monsters, massive war engines	×1

🔍 Don't see your size? Message us — we're constantly expanding our range based on community feedback. If there's demand, we'll add it!

🛒 Which Pack Size Should You Choose?

×1

Try Before You Buy

Characters & unique models

×3

Small Units

3-model cavalry groups

×5

Standard Units

5-model cavalry units

×10

Full Regiments

Large cavalry or two units

×25

Full Army / Best Value

Convert an entire collection

✨ Key Benefits

🔄 Fully Reversible

Switch back to square bases for your old games any time. Remove the converter in seconds — no permanent changes.

🛡️ Model Protection

No scraping, no cutting, no solvents. Your painted miniatures are completely safe throughout the process.

🎨 Fully Paintable

PLA surface accepts primer and paint perfectly. Match your existing basing theme for a seamless look.

💰 Cost-Effective

A fraction of the cost and time of full rebasing. Bulk pack options give excellent value for whole units.

🎯 Tournament Legal

Converts to exact official rectangle base sizes. Compatible with tournament requirements. Always check your specific event rules.

🧩 OBS Compatible

Works seamlessly with Hobby Heaven movement trays, display bases, and the entire Open Basing System ecosystem.

🧩 Part of the Open Basing System (OBS)

These converters are fully integrated into the Hobby Heaven OBS ecosystem — a comprehensive range designed so every component works perfectly with every other.

🔄 Base Converters

All shapes & sizes

📋 Movement Trays

For all converter sizes

🏆 Display Bases

Showcase your models

📐 Standard Bases

All game-required sizes

🎯 Perfect For

⚔️ Returning Warhammer Players

Got a box of classic square-based Warhammer Fantasy armies? Now you can play The Old World straight away without touching a single base.

🎲 Multi-System Players

Play Age of Sigmar and The Old World with the same models. Add converters for TOW, remove them for AoS. One collection, all games.

🏅 Tournament Players

Need to comply with event base size requirements fast? These converters get your army tournament-ready without any prep time.

🎨 Painters & Collectors

Protect your carefully painted miniatures. No risk of damage, no broken paintwork, no stress — your models stay exactly as you made them.

🏭 Production Details

Material	PLA (high-quality FDM 3D printed)
Finish	Paintable surface — accepts primer, acrylic, and enamel paints
Production Time	3 working days (made to order)
Manufactured In	United Kingdom 🇬🇧
Packaging	Careful packaging to prevent transit damage
Shipping	Tracked shipping available
OBS Compatible	Yes — works with all Hobby Heaven movement trays and accessories

💯 Our Compatibility Guarantee

If your converter isn't compatible with your bases, we'll provide a free replacement in the correct size. No questions asked. Just message us.

❓ Frequently Asked Questions

Do I need to remove my models from their original square bases?

No — that's the whole point. Your models stay on their square bases. The square base simply sits inside the converter, which provides the rectangle footprint required by the game.

Will the square base fit securely inside the converter?

Yes. Each converter is precision-engineered for a snug, secure fit. Models won't rock or slide during gameplay. If you have any doubts about fit, message us with your base dimensions and we'll advise.

Can I paint the converters to match my basing?

Absolutely. The PLA surface primes and paints extremely well with both spray primer and brush-applied acrylics. Many players texture and paint their converters to create a seamless look with their existing bases.

Are these tournament legal for Warhammer: The Old World?

These converters produce the exact rectangle base sizes specified in The Old World rules. They are widely accepted at events, but we always recommend checking the specific guidelines for your tournament organiser.

Do these work with Hobby Heaven movement trays?

Yes — full OBS compatibility means your converted models drop directly into our matching movement trays with no modifications needed.

I have an unusual base size — can you make a custom converter?

We're always expanding the OBS range based on customer feedback. Message us with your requirements and we'll do our best to accommodate you or add it to our standard product range.

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🎨 HOBBY HEAVEN 🎨

By Hobbyists. For Hobbyists.

Your Trusted UK Source for Premium Hobby & Miniature Gaming Supplies

Square to Rectangle Base Converters – Warhammer The Old World | OBS Compatible | 3D Printed 🏆 Square to Rectangle Base Converters 🏆 Premium 3D Printed | Tabletop Games Compatible | Made in the UK ⚔️ Part of the Hobby Heaven OBS – Open Basing System ⚔️ 💡 NO REBASING REQUIRED! Your models stay on their original bases. 💡 🔄 What Are Square to Rectangle Base Converters? These precision 3D printed adapters let you place any square-based miniature onto a rectangle base instantly — with no glue, no damage, and no permanent changes. Perfect for players transitioning their square-based armies to Warhammer: The Old World, Kings of War, or any other rank-and-flank system that uses rectangular bases. 🎮 Why Do You Need These Converters? ❌ The Challenge Many classic Warhammer Fantasy armies were built on square bases. With games like The Old World requiring rectangle bases for cavalry, chariots, and monsters, players face a difficult choice: rebase everything (costly and risky) or simply stop using beloved painted models. Neither option is acceptable. ✅ Our Solution Drop your square-based model into the converter. It sits perfectly, holds firmly, and is fully reversible. Switch back to your old game in seconds. Your miniatures are never touched, never damaged, never glued. 🔧 How It Works — 3 Simple Steps 📦 Step 1 — Choose Your Size Select the converter matching your model's current square base size and your target rectangle output. 🔄 Step 2 — Place Your Model Simply place the square-based model into the converter. No tools, no glue, no hassle. ⚔️ Step 3 — Game On! Use your models on rectangle bases. Optionally paint the converter to match your basing style. 📏 Complete Size Guide Input Square Base Output Rectangle Base Typical Use in TOW / Rank & Flank Available Pack Sizes 20mm Square 50×25mm Rectangle Light cavalry, skirmish riders, wolf riders ×1, ×3, ×5, ×10, ×25 20mm Square 60×30mm Rectangle Standard cavalry mounts, mounted heroes ×1, ×3, ×5, ×10, ×25 20mm Square 60×40mm Rectangle Heavy cavalry, armoured horses ×1, ×3 25mm Square 50×25mm Rectangle Light cavalry, fast riders ×1, ×3, ×5, ×10, ×25 25mm Square 60×30mm Rectangle Standard cavalry, knights ×1, ×3, ×5, ×10, ×25 25mm Square 60×40mm Rectangle Heavy cavalry, barded mounts ×1, ×3 30mm Square 60×30mm Rectangle Cavalry characters, command models ×1, ×3, ×5, ×10, ×25 30mm Square 60×40mm Rectangle Ogre cavalry, large mounts ×1, ×3 30mm Square 75×50mm Rectangle Monstrous cavalry, war beasts ×1, ×3 40mm Square 60×40mm Rectangle Elite cavalry, fully armoured knights ×1, ×3, ×5 40mm Square 75×50mm Rectangle Monstrous cavalry, dragon riders ×1, ×3, ×5 40mm Square 100×50mm Rectangle Chariots, war machines with crew ×1, ×3, ×5 40mm Square 100×60mm Rectangle Large chariots, heavy war machines ×1, ×3, ×5 50mm Square 75×50mm Rectangle Large cavalry mounts, wyvern riders ×1, ×3, ×5 50mm Square 100×50mm Rectangle Chariots, siege weapon bases ×1, ×3, ×5 50mm Square 100×60mm Rectangle Large monsters on chariot-style bases ×1, ×3, ×5 50mm Square 150×100mm Rectangle Massive monsters, titans, centrepiece models ×1 100mm Square 150×100mm Rectangle Giants, large monsters, massive war engines ×1 🔍 Don't see your size? Message us — we're constantly expanding our range based on community feedback. If there's demand, we'll add it! 🛒 Which Pack Size Should You Choose? ×1 Try Before You Buy Characters & unique models ×3 Small Units 3-model cavalry groups ×5 Standard Units 5-model cavalry units ×10 Full Regiments Large cavalry or two units ×25 Full Army / Best Value Convert an entire collection ✨ Key Benefits 🔄 Fully Reversible Switch back to square bases for your old games any time. Remove the converter in seconds — no permanent changes. 🛡️ Model Protection No scraping, no cutting, no solvents. Your painted miniatures are completely safe throughout the process. 🎨 Fully Paintable PLA surface accepts primer and paint perfectly. Match your existing basing theme for a seamless look. 💰 Cost-Effective A fraction of the cost and time of full rebasing. Bulk pack options give excellent value for whole units. 🎯 Tournament Legal Converts to exact official rectangle base sizes. Compatible with tournament requirements. Always check your specific event rules. 🧩 OBS Compatible Works seamlessly with Hobby Heaven movement trays, display bases, and the entire Open Basing System ecosystem. 🧩 Part of the Open Basing System (OBS) These converters are fully integrated into the Hobby Heaven OBS ecosystem — a comprehensive range designed so every component works perfectly with every other. 🔄 Base Converters All shapes & sizes 📋 Movement Trays For all converter sizes 🏆 Display Bases Showcase your models 📐 Standard Bases All game-required sizes 🎯 Perfect For ⚔️ Returning Warhammer Players Got a box of classic square-based Warhammer Fantasy armies? Now you can play The Old World straight away without touching a single base. 🎲 Multi-System Players Play Age of Sigmar and The Old World with the same models. Add converters for TOW, remove them for AoS. One collection, all games. 🏅 Tournament Players Need to comply with event base size requirements fast? These converters get your army tournament-ready without any prep time. 🎨 Painters & Collectors Protect your carefully painted miniatures. No risk of damage, no broken paintwork, no stress — your models stay exactly as you made them. 🏭 Production Details Material PLA (high-quality FDM 3D printed) Finish Paintable surface — accepts primer, acrylic, and enamel paints Production Time 3 working days (made to order) Manufactured In United Kingdom 🇬🇧 Packaging Careful packaging to prevent transit damage Shipping Tracked shipping available OBS Compatible Yes — works with all Hobby Heaven movement trays and accessories 💯 Our Compatibility Guarantee If your converter isn't compatible with your bases, we'll provide a free replacement in the correct size. No questions asked. Just message us. ❓ Frequently Asked Questions Do I need to remove my models from their original square bases? No — that's the whole point. Your models stay on their square bases. The square base simply sits inside the converter, which provides the rectangle footprint required by the game. Will the square base fit securely inside the converter? Yes. Each converter is precision-engineered for a snug, secure fit. Models won't rock or slide during gameplay. If you have any doubts about fit, message us with your base dimensions and we'll advise. Can I paint the converters to match my basing? Absolutely. The PLA surface primes and paints extremely well with both spray primer and brush-applied acrylics. Many players texture and paint their converters to create a seamless look with their existing bases. Are these tournament legal for Warhammer: The Old World? These converters produce the exact rectangle base sizes specified in The Old World rules. They are widely accepted at events, but we always recommend checking the specific guidelines for your tournament organiser. Do these work with Hobby Heaven movement trays? Yes — full OBS compatibility means your converted models drop directly into our matching movement trays with no modifications needed. I have an unusual base size — can you make a custom converter? We're always expanding the OBS range based on customer feedback. Message us with your requirements and we'll do our best to accommodate you or add it to our standard product range. Keywords: square to rectangle base converter, warhammer base converter, the old world base adapter, 3D printed base converter, square base to rectangle, warhammer fantasy bases, rank and flank basing, rebasing solution, no rebase, OBS open basing system, hobby heaven, 20mm square base, 25mm square base, 30mm square base, 40mm square base, 50mm square base, 100mm square base, 50x25 rectangle, 60x30 rectangle, 60x40 rectangle, 75x50 rectangle, 100x50 rectangle, 100x60 rectangle, 150x100 rectangle, cavalry bases, chariot bases, monster bases, war machine bases, tournament bases, warhammer old world, kings of war bases, movement tray compatible, wargaming accessories, miniature basing, tabletop gaming, UK made, painted miniature protection, PLA 3D print, wargaming hobby UK 🎨 HOBBY HEAVEN 🎨 By Hobbyists. For Hobbyists. Your Trusted UK Source for Premium Hobby & Miniature Gaming Supplies

Specifications

Choose Quantity 20mm Square to 50x25mm Rectangle Converters x1 pc
Unit of Sale 1-25pcs
Options Square to Rectangle Bases Converters
Customizable Yes (paintable surface)
Miniature Scale 28-32mm Scale Miniatures
Designed for Efficient unit movement, Display
Manufacturing Method 3d Printed (PLA, FDM)
Colour Black (can be painted)
Top edge Flush with base edge
Brand Hobby Heaven. By Hobbyists. For Hobbyists.
Type Shape Converters
Production Time Made to order (up to 3 business days)
OBS Compatible Yes (Open Basing System)
Base Removal Bottom opening for easy removal
Features Snug Fit, Stable, Easy Base Removal
Shipping Fast Shipping - RM24
Compatibility: Miniature Wargaming
Country/Region of Manufacture United Kingdom
Country of Origin United Kingdom

ABOUT US

Welcome to Hobby Heaven!

We're a brand built by passionate hobbyists for hobbyists. Our mission is to support all your creative endeavors, whether you're into modeling, wargaming, crafting, or art. As enthusiasts ourselves, we understand the importance of quality supplies at affordable prices.

Our carefully curated selection of high-quality materials is designed to inspire and empower hobbyists and artists alike. We're particularly proud of our innovative, cost-effective basing system - a game-changer for modelers and wargamers looking for professional results without breaking the bank.

At Hobby Heaven, we're dedicated to providing exceptional customer service and ensuring your creative projects are a success. Our team is always ready to offer advice, share techniques, or help you find the perfect supplies for your next masterpiece.

Thank you for choosing us as your trusted partner in creativity. We're excited to be part of your hobby journey!

PAYMENT

We accept payment by PayPal and Credit / Debit cards entered on eBay only. You must be registered with PayPal or eBay to buy from us.

SHIPPING

We primarily use RM24 for shipping, and we can arrange other courier services upon request. For large international shipments, we utilize FedEx. Once your order has been dispatched, you will receive tracking information. For domestic deliveries, the estimated arrival time is usually 1-4 days.

RETURNS

Please ensure that all items are returned in their original condition. Returns are processed within 1-2 business days of receipt. Refunds are issued minus the original shipping cost. All returns are handled in accordance with eBay's policies.

At Hobby Heaven, we strive to provide our customers with the best possible online shopping experience. Our commitment to excellent customer service extends well beyond the delivery of your order.

We encourage you to reach out with any questions or concerns regarding your purchase. The most convenient way to contact us is through the eBay messaging system.

Our dedicated customer service team responds to messages within 24 hours, Monday through Friday, between 8:00 AM and 3:00 PM GMT.

Your satisfaction is our top priority. We're here to help and look forward to assisting you!

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