Technical drawing of the 20 to 25 mm round base converter: 25 mm outer diameter, 4 mm tall.

Round to Round Base Converters 3D Print Full Range

20 to 25mm round bases Converters x1 pcs
£1.89
£1.89
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Technical drawing of the 20 to 25 mm round base converter: 25 mm outer diameter, 4 mm tall.
  • Technical drawing of the 20 to 25 mm round base converter: 25 mm outer diameter, 4 mm tall.
  • A range of black 3D-printed round base converters in several sizes, laid out on a white background.
  • Feature graphic: a round base seated in a converter, noting the snug friction fit and the open underside.
  • Size comparison chart showing the round base converter range drawn to scale.
  • A single black 3D-printed round base converter that takes a 20 mm base to 25 mm, shown on white.
  • Technical drawing of the 25 to 50 mm round base converter: 49 mm outer diameter, 5 mm tall.
  • Pack of 5 black 3D-printed round base converters, 25 mm base to 50 mm, shown loose on white.
  • A single black 3D-printed round base converter that takes a 20 mm base to 25 mm, shown on white.
  • Pack of 5 black 3D-printed round base converters, 20 mm base to 25 mm, shown loose on white.
  • Pack of 10 black 3D-printed round base converters, 20 mm base to 25 mm, shown loose on white.
  • A single black 3D-printed round base converter that takes a 20 mm base to 32 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 25 mm base to 28 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 25 mm base to 32 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 28 mm base to 32 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 25 mm base to 40 mm, shown on white.
  • Technical drawing of the 25 to 50 mm round base converter: 49 mm outer diameter, 5 mm tall.
  • A single black 3D-printed round base converter that takes a 32 mm base to 40 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 32 mm base to 50 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 40 mm base to 50 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 40 mm base to 60 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 50 mm base to 60 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 50 mm base to 70 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 50 mm base to 80 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 60 mm base to 70 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 60 mm base to 80 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 60 mm base to 90 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 80 mm base to 90 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 80 mm base to 100 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 80 mm base to 130 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 80 mm base to 160 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 90 mm base to 100 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 90 mm base to 130 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 90 mm base to 160 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 100 mm base to 130 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 100 mm base to 160 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 100 mm base to 200 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 130 mm base to 160 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 130 mm base to 200 mm, shown on white.
  • A single black 3D-printed round base converter that takes a 160 mm base to 200 mm, shown on white.
  • Technical drawing of the 50mm round to true 60mm round base converter: 60.0mm outer diameter, 5mm tall.
  • A single base converter that takes a 50mm round base to a true 60mm round footprint, shown alone.
  • Three base converters that take a 50mm round base to a true 60mm round footprint, shown loose.
  • Five base converters that take a 50mm round base to a true 60mm round footprint, shown loose.
  • Ten base converters that take a 50mm round base to a true 60mm round footprint, shown loose.
  • A single round base converter ring, 3D-printed in PLA, shown alone.
  • Technical drawing of a round base converter ring: 79.1mm outer diameter, 55mm opening, 6mm tall.
  • Three round base converter rings, 3D-printed in PLA, shown loose.
  • Five round base converter rings, 3D-printed in PLA, shown loose.
Round to Round Base Converters 3D Print Full Range

Round to Round Base Converters 3D Print Full Range

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£1.89
£1.89
Taxes included. Shipping calculated at checkout.
Key Dimensions · This Option
Fits base 20 mm round
Converts to 25 mm round
Overall height 4.0 mm
Outer footprint 25.0 mm diameter
Material 3D-printed PLA

Measured from this listing's own technical drawing (20_To_25mm_Round_Base_Converter.jpg); outer footprint read off the bottom face. Top face after taper 23.76 mm. Seat (recess the input base drops into) 20 mm, opening 17 mm. Nominal to_* left as the fit claim per DICTIONARY §3.

Number of packs
In stock

Same-day dispatch before 3pm Mon–Fri · Free UK delivery over £70 · 30-day returns

DWG · Product Information

PROJ: CONV/RO/20-25/1 · SHEET 2 / 4

View · Overview

Product overview

Drop a miniature on its round base into one of these converters and it is held by friction on a larger round footprint — no glue, no rebasing, nothing removed from the model. The top edge sits flush, and an open underside lets you push the base back out without gripping the model, so a finished, painted miniature can move up a size and go back again. That covers rules changes, unit re-roles, a D&D character stepping up a size, or a big model needing a steadier footprint. Sizes run from 20 mm rounds up to 200 mm, and a base can usually move up one step or several — a 25 mm base can go to 28, 32, 40 or 50 mm. Each converter is 3D-printed to order in black PLA in the UK; we usually keep some stock, but we may need a while to process your order.

  • No glue, magnets or rebasing — the round base sits in a round recess and holds by friction fit, and an open underside lets the base be pushed out from below without gripping the model
  • The base's top edge sits flush with the converter, so the model is not raised
  • Textured top surface takes primer and acrylics, so the converter can be finished to match existing basing
  • 3D-printed black PLA, made to order in the UK — fine layer lines and a Z-seam are normal, not defects, and become less visible under primer
  • Part of the Open Basing System — converters, bases and movement trays in the range are designed around the same sizes

Compatible with popular tabletop miniatures; not affiliated with, endorsed by or produced by Games Workshop.

Notes · Q & A

Can a converter change my base footprint without rebasing?

OBS converters are designed to adapt an existing base where the selected conversion route fits that original footprint. Fit is route-specific, so confirm the selected option and technical drawing before ordering. Check Technical Specifications where added height matters.

How do I choose the correct converter?

Start with the footprint you already have, then select the target footprint you need. Compare both the accepted inner fit and the outer footprint with the technical drawing; matching nominal labels alone is not enough.

How should I use the technical drawing?

Choose your option first, then use the technical drawing and Technical Specifications to check the physical dimensions of the product. When matching an existing part or accessory, use the drawing rather than relying on the product name alone.

Can I rely on the nominal size alone?

No. Products with similar nominal sizes can have different physical dimensions or fit differently across brands and systems. Check the technical drawing, specifications and any product-specific compatibility note before ordering.

Notes · Logistics

Shipping

Orders placed before 3PM (Mon–Fri) are dispatched same day. Free UK delivery on orders over £70. International shipping available.

Returns

If you're not happy with your purchase, contact us within 14 days for a full refund or exchange. Items must be unused and in original packaging.

Table · Specification

Technical specifications

Product details
Brand
Hobby Heaven
Product code
CONV/RO/20-25/1
Type
Base
Shipping weight
10 g
Conversion
Fits base
20 mm round
Converts to
25 mm round
Geometry
Overall height
4.0 mm
Outer footprint
Ø 25.0 mm
Material & finish
Material
3D-printed PLA
Classification
Range
Base Converters
Format
Physical

Product

Round to Round Base Converters 3D Print Full Range

Code (proj)

CONV/RO/20-25/1

Ship. weight

10 g

Brand

Hobby Heaven

Hobby Heaven · Open Basing System

Sheet 2 / 4

End of sheet