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Square to Round or Oval Base Converters

Creation's quality: 5.0/5 (1 vote)
Evaluation of members on the printability, utility, level of detail, etc.

3D model description

Have all of your 20mm and 25mm square based models been invalidated by rule set changes? Are you changing rulesets to a skirmish based system? Are you staring down the barrel of having to re-base 10's if not 100's of models? Well fret no more. These base converters clip onto your existing 20mm or 25mm square bases, turning them into 25 mm rounds or 32mm rounds. Ok enough with the smarmy plug.

These converters have been specifically designed for GW Citadel bases. It is not without its drawbacks, for example, you can see from the photos that the corners of a 20mm square base (approx 27mm on the diagonal) protrude from the perimeter of the 25mm round*. These 'ears' are stick out about 1.5mm and thus the converter may not suit the purist.

25mm square to 32mm round and 25mm x 50mm rectangular to 60mm x 35mm ovals have been added.

2019-02-05 Update: Added - 40mm square to 50mm round; 50mm square to 60mm round; 50x100 rectangular to 70x105 Oval; 50x100 rectangular to 95x120 Oval; 60x100 rectangular to 95x120 Oval.
Also added 48x100 rectangular to 70x105 Oval; 48x100 rectangular to 95x120 Oval as the "50mmx100mm" rectangular base I had from GW was actually 48mm wide not 50mm.

2019-02-18 Update: Added 50mm square to 70x105 Oval converter. Prints in two pieces, the smaller piece slides in to lock the model in place.

2020-11-23 Update: Added 20mm square to 28mm round converter

*Note: The movement trays that accommodate the 20mm converters can be found here:

3D printer file information

  • 3D design format: STL Folder details Close
    • 20-25MM_Square_to_Round_base_converter.stl
    • 20-28mm Square to Round base converter.stl
    • 25-32_mm_Square_to_Round_base_converter.stl
    • 25x50_-_35x60_mm_Rectangle_to_Oval_base_converter.stl
    • 40-50_mm_Square_to_Round_base_converter.stl
    • 48x100_Rectangle_to_70x105_mm_Oval_base_converter.stl
    • 48x100_Rectangle_to_95x120_mm_Oval_base_converter_not_tested.stl
    • 50-60_mm_Square_to_Round_base_converter.stl
    • 50x100_Rectangle_to_70x105_mm_Oval_base_converter_not_tested.stl
    • 50x100_Rectangle_to_95x120_mm_Oval_base_converter_not_tested.stl
    • 50x50_-_70x105_mm_Rectangle_to_Oval_base_converter.stl
    • 50x50_-_70x105_mm_Rectangle_to_Oval_base_converter_back_stop.stl
    • 60x100_Rectangle_to_95x120_mm_Oval_base_converter.stl
  • Last update: 2020/11/24 at 05:16
  • Publication date: 2020/01/29 at 18:00





Kal is a 3D printing hobbyist who designs and prints 3D printable items for fun, usually to support one or more of the various tabletop miniatures that Kal and/or friends are currently playing.

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